Fingertip gyro abroad, also known as Finger Spinner, is a small toy with a bearing symmetrical stru...
View details +With the rise of multimedia equipment, the International Electrotechnical Commission introduce...
View details +In order to regulate the electromagnetic compatibility of electronic products, all developed countr...
View details +The standard battery is a chemical battery. Because of its relatively stable electromotive force an...
View details +1. EU RoHS directive harmful substance detection After the EU RoHS Directive (2002/95 / EC...
View details +For the use of wireless frequency transmitting products when entering the markets of various...
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