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长期收购库存积压各种电子元件，家电、通讯、电脑、设备、数码等方面的所有电子元件,配件,半成品,成品等等，收购IC，晶体，二极管，三极管，单片机，钽电容，电解电容，片容片阻，FLASH，电感，继电器，电位器等等，收购内存条、网卡、显卡
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它在测量直流电流的时候，也是根据不同的档位，并联了不同电阻值的电阻，这样在并联电阻的两端的电压降，必须满足满量程的指示，又不至于万用表表头过流。测量直流电流时，通过并联电阻分流，根据分流后的指示电流计算得到的电流值。它在测量被测电阻器的电阻值时候是根据全。电路欧姆定律的公式。这样就要求万用表内部附加一只1.5v干电池和一块9v的高压叠层池。而1.5v的干电池，主要用于欧姆档1Ω~1kΩ的低阻测量，而9v叠层电池主要用于万用表的高阻档10K、100K档位来测量兆欧级（MΩ）电阻器的电阻值的测量。