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Actucation has unique problem bank for Calculus - I & II, AP Calculus, College Physics and AP Physics, where a student can learn by practicing problems. Detailed Solutions, theory and solved examples are provided for each concept.

Shenzhen Shenchuang Hi-Tech Electronics CO.,LTD is a professional manufacturer of researching, producing and marketing kinds of high-quality portable powers, mobile phone chargers, car chargers, usb cables and other related products. We provide OEM and ODM services for many importers with their own logos or brands in their market. Depending on high quality and service, we also have MFI for our products,and also have CE ROHS FCC,RCM,etc certificate for our products.

Shenzhen Bester Technology Ltd was founded in2007.Our team has been sparing no effort to develop the ultrasonic aroma diffuser products since 2009. We focus on ultrasonic aroma diffuser products and committed to creating the utmost values for our customers from all over the world. Bester team has been adhering to the "good function, good appearance, best quality”, producing best aroma diffuser products for our customer. The products made by our team are not only a houseware product, but also an “artwork”. We believeBester will be your best choice! Our team: Bester has an experienced R&D team, including mechanical engineer, Electronics Engineers, tooling Engineer. They are the elite of the industry and good at team work,to make a perfecting product, to improve every detail at any time.

Established in 1999 and based in Bao’an, Shenzhen, China, Maxway is a full service Electronic Manufacturing Services (EMS) provider. We offer complete end to end manufacturing solutions including material procurement, printed circuit board assembly (PCBA), box-build, high-level assembly, system level test, configure to order, and order fulfillment.

Shenzhen Sunsoar Circuit Technlogy is specialized in Printed Circuit Board & PCB Assembly including components sourcing, function test and complete assembly for clients all over the world.All of our base materials and process can meet Rohs and UL international certification. with our 9-year OEM PCB & PCBA experience,we have built up our own Research & Development Department to develop Yunlife Series new smart household finished product such as humidifier diffuser,night light. We rely heavily on customer and manufacturing feedback to produce a world-class production, Our staff enjoys supporting customer to find a solution to reduce product cost without sacrifice quality,Sunsoar will be your right choice.

EQ METAL CO.,LTD. is a professional supplier and global exporter specializing in metal manufacture and exportation, gathering sheet metal processing, customized cabinet solutions providing and complete equipment manufacturing. It is equipped with top-notch sheet metal processing equipment, including CNC laser cutting machine, CNC turret punch, CNC bending machine, CNC shearing machine, spot welder, argon arc welding machine, cogas protective welder, etc. Therefore the company is capable of designing, developing, processing all kinds of sheet metal products. In addition, its products also comprise low voltage distribution equipment, various kinds of standard and non-standard industrial control cabinet, network cabinet, outdoor cabinet, operation table and so on. EQ METAL CO.,LTD. was founded in early 2009. Ever since its establishment, it has focused on product development as well as solidly pushed the establishment and implementation of quality control system according to market trend and customer requirements. It has worked diligently for automation control and sheet metal processing. EQ METAL CO.,LTD. has produced all kinds of standards and non-standards cabinets in high quality by reference to international advanced international cabinet standard. Theses cabinets are widely applied to many industries such as automation control, mechanical equipment, communication network, power control because of their beautiful appearance, durable & reliable, universal and flexible assembly. "Good grasp of every detail, control all processes, meet the needs of every customer" is what we pursue unremittingly. "Make masterpieces inside, achieve brands outside" is a target that we always struggle for.

Home  About Us SHENZHEN IMPROVE BATTERY CO.,LTD is a professional manufacturer specializing in researching, developing, manufacture and selling batteries in Shenzhen ,china. It was set up in 2005.our main products including NIMH battery/pack, Li-polymer battery. Rc Lipo battery. these products are widely used in the industry of telecommunication, digital products, portable computers, electronic products, lightening devices, toys, GPS. medical Instrument, backup battery and emergency devices. We not only provide high quality product with excellent services, but also advanced battery solutions.  Please feel free to contact us if any product is in your need.

Shaanxi Yahua Lighting Electric Equipment Co.,Ltd. was established in 2001, which is specialized in the development,manufacture,sales and installation of outdoor LED lighting products. Our main products include Street Light, Solar Street light, LED High bay light, LED Flood Light, LED Landscape Light, High Mast Light etc. We have two factory one is specialized in manufacturing LED lights and another factory focus on light pole and high mast light. Our products have passed CE,ROHS, ISO9001,CQC,IES,IEC certificate and our LED lights are mainly exported to USA,Australia,Europe, Africa, UAE, Philippines, Brazil etc.Countries. In those several years, we have broken the bottlenecks of the most critical technology in the high power LED Light, solving the problems of light intensity, lumens, heat radiation, light attenuation efficiently. Meanwhile our company construct many national large-scale highway road lighting and urban roadway LED lighting projects. Our products has obtained good reputation from our customers Yahua lighting has set up a professional team of senior engineers and designers and would like to provide for our customers with high standard LED Lighting solution and good service.

Our Factory Dalian Taijia Technology Co.,Ltd is a high technology company which specializes in supplying and supporting of flow measurement equipment. prime products include ultrasonic transit-time flow meter, magnetic flow meter, vortex flow meter ,turbine flow meter and ultrasonic level meter, ultrasonic thickness meter etc. Our products are widely used in water supply and drainage water, petroleum and chemicals, food and pharmaceutical. We thank you for visiting our Web Site and look forward to the opportunity of being of service to you. Our Product 1.Clamp-on Ultrasonic Flow Meter 2.Liquid Flow Meter 3.Gas Flow Meter 4.Ultrasonic Level Meter 5.Ultrasonic Thickness gauge 6.Rebar Locator 7.Rebound Hammer Product Application Liquids: water/wastewater,oil,fuel,chemical. Construction industry NDT Our Certificate CE Production Market We have sold product in more than 30 countries, such as America. Italy. India. Korea. Germany. Canada. Australia etc.

Electric motor manufacturing of Wenling Sihai Motor Factory traces back to a small plant founded in coastal town of Taizhou in Zhejiang province, China, in mid-1980''''s. After over 30 years of hard work , the company has grown into a motor manufacturing base with facilities located in Shanghai and Anhui, along with the headquarters in Taizhou. And in 2010, we established our US headquarters ( Power Tech Electric Motors, LLC ) in Overland Park, KS and warehouses in North Carolina, Atlanta. Tens of millions of dollars of electric motors each year are made and shipped from these locations to the North American market.

About Us Contact Us Feedback From renting a 2000 square meters’ workshop in Geleshan of Chongqing in 2005, to owning an 8600 square meters’ modern comprehensive factory in YinXiang Industrial Park of Chongqing, hardy has transformed into a famous environmental testing solution provider from a common environmental testing equipment producer after 11 years’ hard working. As a “Rising star” in the field of environmental testing, Hardy not only obtained certifications such as ISO9001:2008, ISO14001:2004, CE etc., but also owned several rewards, honour and 17 Chinese Patents awarded by Chinese government such as innovation design, optimal control etc., As a “Main force” in the environmental testing domain, Hardy provides products to customers such as climate testing chamber, stress screening chamber, AGREE chamber, Temperature shock chamber, walk in chamber, low pressure chamber etc. Besides the regular testing products, Hardy has experience in designing and producing of multi-function large testing chamber and successful cases such as multi-function large vehicle drive in chamber, explosion safe chamber with each level of protection and function used for altitude environmental simulation, soldier training. The product application of Hardy involves in many such as electron industrial, engineering, machining, vehicle, biology, pharmacy, aviation, aerospace, military and alternative energy etc. Hardy, a national industrial of China, starts from the famous industrial city in west south of China. The customers of Hardy are coming from all over the world. Hardy owned the first group of customers from North America, Europe, East Asia and became the designated supplier of some large global enterprises. At the same time of proud of itself, Hardy is not satisfied the result that acquired now.

After 10 years of development, TGE already has an entire manufacturing technology and advanced production equipment and several production lines for high-performance AC metal oxide varistors, high-performance DC metal oxide varistors and high gradient metal oxide varistors. High-performance metal oxide varistor and the manufacturing technology won the 2005 National Key New Product Award, and had contributed for the successful development of UHV 1100 kV arresters.

Hangzhou Siyiou network technology co., LTD. Is professional search engine optimization service provider in China, Siyiou long-term focus on search engine optimization industry and application of technical solution development and operations. Over the years, we have been tireless pursuit of technological innovation, constantly improve the technology process to provide customers with more perfect and professional solutions.

PCBonestop.com is a one-stop PCB solution for PCB fabrication and assembly services, located in Shenzhen, China. We have been specializing in quick turn prototype and small volume PCB manufacturing for over 10 years. We also provide PCB assembly, electronic components and SMT stencils as well. You can count on us in your specific needs, from simple boards to complex designs, for small quantity and large scale production. We have established good cooperation relationship with more than 10,000 customers covering over 60 countries all over the world. Our products are widely used in many fields, such as telecommunication, industrial control, medical, national defense, power electronics, automatic, computer, IOT etc. PCBonestop.com is certificated with ISO 9001:2008, ISO 14001:2004, ISO 13485, TS 16949, ITAR Registered, UL Registered, RoHS Compliant, IPC Member, etc. In order to ensure the customers’ satisfaction, which is the core work of PCBonestop, we have 1) built a flexible production and service system and trained a group of composite technology, production and customer service teams in electronic circuit industry chain; 2) set up a systematic delivery platform and quality guarantee system. Our delivery performance, quality control, customer service and quick response to complaints endue us with a leading position in PCB industry.

Shenzhen Dali Technology Co., Ltd is a high-tech enterprise specialized in   R & D, production and sales of batteries, existing products covered by lithium manganese, zinc manganese and silver oxide button cell; alkaline battery disposable carbon column two column; Ni MH battery and rechargeable battery, charging spot group and other four series of more than and 50 varieties.

Pinsheng Electronics Co.,Ltd was established in 1993 , which was a UL, ISO9001 and ISO/TS16949 certificated company with 23 years experience in PCB manufacturing. Through stable cooperation with domestic and oversea customers, PS has grown to a group with 3 department for production of rigid, flex and quick turn delivery department. Our products are widely used in consumer products, communication, industrial control, automotive, computers and lighting etc.. Which provide one stop services to customer and have long steady cooperation with leader enterprise such as Huawei, Samsung, Foxconn. We made new investment since 2013 till now update production lines and expand capacity to meet growing demand from customers. Automatic machine is widely use in the production line to keep high and stable quality such as Automatic AOI on the etching line,Automatic open-short test machine, Automatic visual inspection machine,Automatic Exposure machine

PCBWIN is a professional supplier of high-quality PCB and assembling service in China, it is a unit of ShiYing Group, which focuses on manufacturing high-quality PCB. We are specialized in manufacturing PCB. Now we have helped thousands of engineers, electronics design company and electronics industry enterprises to complete their work on electronic products. Our products sell well all over the world,involving in communication, industrial automation, IT, medical, electronics, aviation, spaceflight, nation defense filed and so on. We devote to manufacturing PCB and providing assembling service with the strictest quality-control standards. So far, we have serviced more than 8,000 oversea customers. Competitive price, high quality and short delivery time are the good impression we have left on user's mind.

HUZHOU CHENGERXING ENERGY TECH CO.,LTD is originated from Zhejiang Nuociss New Energy Technology founded in 2006,we have 9 years experience in design and manufacturing lithium battery.Company is certified by ISO 9001:2008, battery cells are approved by CE,UN, and ROHS. Our products are in the field of E-bike battery,electric bicycle battery,Electric scooter battery,Electric golf trolley battery and LED light battery. All the batteries are carefully approved by our battery experts.Our mission is to produce most safe, reliable, cost effective and high quality li-ion battery for our customers,offer the best warranty service.

Our History Shanghai Jiameng Electrical Equipment Co., Ltd., also known as MELEC, was founded in 1992. In 2011, both of our subsidiaries, Jiangsu Jiameng Electrical Equipment Co., Ltd and Shanghai Jiameng International Trading Co., Ltd, were formed. We are specialized in production of high quality cable accessories. Our company has expended to more than 500 employees with a factory compound of more than 50,000 square meters. Our Factory MELEC factory is located in Jiangsu Province Binhai Industrial Park, occupying an area of 48,000 square meters, equipped with the most advanced production line and production equipment, strictly complies with scientific production processes, and builds up a strong and leading manufacturing platform. Our Product Our products include cable lugs, cable connectors, aerial bundle cable accessories, and heat shrink accessories. Product Application Low and medium voltage power transmission, distribution and cable connection. Our Certificate ISO9001 quality management system. Products follow NFC, IEC, EN, GB standards. Production Equipment CNC Tapping Center, Friction Welding Machine, CNC Turning Center, Automatic Dieing out Press and etc. Our service We offer you analysis of products in various markets and carry on fieldwork to make strategies based on market demands. We offer you a full range of product training, operation training and technical knowledge training. We will provide you the most professional and accurate Certification Report.

Xinchenger Electronics co.,Ltd established in 2009,Website:http://www.xce-pcb.com,we have commited ourselves to manufacturing various of hi-frequency microwave pcb and multi-layer board including fastest sample production. we keen on helping customers shorten the period of production development and 24 hours sample service is available Our company's sufficient stocks as follow: Rogers,TACONIC,Arlon,Isola,F4B,TP-2,FR-4 Our products mainly used in the area of high technologies like Military industry,Electronics, communication device,Aerospace Since the day of company foundation we continuously enaged in researching special and high precision printed circuit boards with strong production capability of 2 to 28 layers of highly precise impedence,multi-layer blind buried,multi-layer,high TG,copper substrate,mix-compression, Ceramic substrate PCB. We are hornored to obtain sound reputations over our wolrdwide customers on the basis of fine qulity,prompt delivery,satisfied after sales service for many years and we assure our customers that we will return the favors with more and more superior products in the near future.

Howen Technologies Co., Ltd,Website:http://www.howenvss.com, was established in 2008 and dedicated to R&D, manufacturing and sales of vehicle surveillance system (VSS) including Mobile DVR, Mobile Data Terminal and Vehicle 3G/4G wifi router,etc and CCTV security products. after several years' fast growth, Howen becomes the leading supplier and solution provider on VSS in China. With good reputation of high quality, cost-effectiveness, tailor-made service and professional support, Howen's products and systems have been widely used in more than 50 countries such as UK, USA, Canada, Australia, South Africa, Nigeria, U.A.E, Qatar, India and Brasil,etc. and applied for various kinds of industries like public bus, school bus, tourist bus, Taxi, police car, truck, logistic, etc. and Howen's CCTV products and systems have been widely applied in Hotel, Shopping Center, Education, Hospital, and “City Surveillance”

SHENZHEN SINOLI ELECTRONIC CO., LTD - It takes expertise and experience to cope with the competition. Together with you,Website:http://www.sinoli-batteries.com, we strive for the very best results. Our passion for lithium batteries from cell to pack, serve for solar power energy store, outdoor power supply, back up power service etc. At SNL engineered technologies, we have over 5years experience providing design guidance, design services and state of the art Chinese based manufacturing. - Battery Chemistry Selection - Battery Charger Selection/Design - Battery Fuel-gauge Suggestions Based On Application - Battery Safety-Circuitry Recommendations - Battery Construction Suggestions - Regulatory Guidance - Production Test Equipment We design and develop your Point of Sales projects with only one objective: Make consumers love your brand! That objective is achieved using creative and innovative ideas that are designed, manufactured and installed with technical excellence and with an eye for the right budget. We are growing together with our customer ever and forever! “TAKE PROFESSOR BESIDE YOU! CHOOSING THE RIGHT BATTERY TECHNOLOGY FOR YOUR SYSTEM”

XIAMEN SRISEN TECHNOLOGY CO.,LTD is the professional manufacturer and supplier in the field of electrification,Website:http://www.xmsrisen.com, power and industrial automation,automotive industry,pneumatic components,mechanical engineering and other metal fabrications. We can supply switchgear, vacuum circuit breakers, transformers, and relative power equipment components, pneumatic fittings, automotive spare parts, and other OEM metal parts. Located in Xiamen, a beautiful coastal city in southeast of China, we enjoy convenient water, land and air transportation. With the production capacity of punching, stamping, machining, bending, welding, laser cutting, surface treatment and assembly, our skilled staffs and management teams serve customers from worldwide. “Quality and innovation, environment and humanities” is our sustainable development strategy. With years of experience in the industry, SRISEN hopes to be your professional and reliable partner.

Xing Da is one of the best professional manufactures and suppliers which make ceramic circuit board and carbon oil circuit board in China. Based on our self-dependent innovation and self-research,Website:http://www.xdxpcb.com, our company not only adopts international advanced technology, but also introduces perfected and advanced equipment and test machines from Japan and America. Now we have developed one of the top manufacturers with advanced technology and high strength in the field of ceramic pcb and carbon oil pcb. Our Alumina circuit boards and Aluminium Nitride circuit boards are widely used in high power LED, semiconductor laser, semiconductor cooler, communication devices, LGBT modules, RF and microwave devices, medical equipment, military radar, GPS antenna, Oscilloscopes, TV sets, auto ignition, fuel level sensors, voltage regulation system, missiles, satellites, helicopters, warships and other fields. Our carbon circuit board are widely used in automotive parts, electric tools , and game controller. Our products are sold to all over the world, especially in America, Europe, and the Middle-East. With top quality, favorable price, and high-quality supporting service, Our company have a good reputation from customers from different countries and fields.

- Builded in 1993,Website:http://www.gaoke-ant.com, our company mainly produces base station of cluster system, Antenna for vehicle-mounted machine and handset. - In 1995, our company successfully developed Multiple signal multiplexing platform , is the first domestic . - In 1998, our company researched and developed base station duplexer for domestic CDMA , is the first domestic initiative. - In 2001, the domestic intelligent electric adjustable antenna of phase modulation system, is the domestic initiative - In 2005, GPS antenna was researched and developed, which sold pretty good. Our company is one of the first domestic GPS antenna manufacturers. -2008 , the year of GPS industry rapid development , our GPS antennas got lots of commend in this industry . And our company became the leader of GPS industry. -in 2014, Gaoke builds a solid pragmatic foreign platform in all the antenna application and achieve a good result .

Hangtung Electronic Technology Co., LTD is founded in 1987,Website:http://www.ht-transformer.com, and located in Shijie Town of Dongguan City which is the most famous Manufacturing City of China. We are specialized in designing & manufacturing wide range of electronic transformer, high frequency transformer, low frequency transformer, AC/DC power Adapter, Switching Power Supply, inductor, Choke Coil, Shielded Wire and EMI Filter. Our products are widely applied in electronic, electric and computer products like electronic flashlights, stage stroboscopes, energy saving lamps, EL cold lamps, alert lights, navigating lights, medical facilities, computer equipment, wireless electronics, mobile communications, DVD, DVB, tablet computer, air conditioning, water drinking machines, televisions, electric fans, Lighting etc.  Now, our company covers over 10000 square meters, has 800 employees. Furthermore, Hangtung Electronic Technology Co., LTD owns a series of equipment for modern production and product testing, and a number of high-quality technology management personnel. The company consists of the development, engineering, quality, sales and other departments, all with advanced digital management system, strict quality control, be sure to make all kinds of product quality is stable and reliable. Moreover, the company is widely implementation of the ISO9002 quality control system, has been approved by UL certification. Our products are welcomed by customers from Japan, Taiwan, Korea, America, etc.Our company philosophy: Quality and reputation first.  Our company has consistently adhered to quality, delivery, reasonable price and service to satisfy customer's requirement. We are full of confidence to the future and looking forward to your corporation. Welcome to contact and visit us!

Guangzhou WaMa Battery founded in 2006,Website:http://www.gzwamabattery.com, After more than several years development, time now we have button cells batteries, Li-ion Polymer battery,18650/RCR123A battery and Chargers,etc. 2011 year--WAMA ELECTRONICS TECHNOLOGY CO.,LTD was founded in HongKong. 2014 year--WAMA ELECTRONICS TECHNOLOGY CO.,LTD was founded in Guangzhou. 2009 year—we passed ISO9001:2000 certification, the company management is more perfect. Time now is an integrated hi-tech manufacturer in the R & D, production and marketing, all products have passed SGS,ROHS,UL and CE certification. We are always insisting on the business tenet: "quality first, price first".Our products have very good credit in USA,European,the South East etc market. “WaMa” have become a reliable brand in most peoples’s heart, so time now more and more peoples to use WaMa batteries. At the same time, we are developing China local market,too. For future we will be insiste on more higher quality,more cheaper price and more better service