根据控制要求，结合程序设计，得到系统电路图和系统接线图，列出了所需要的元器件表。

Under the control requirements, the combination of programming, system by system and circuit wiring diagram, the list of the necessary components table.

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电阻表的工作原理为，生产一个电流流过测量的元器件，在其上生产电压，并测量其值。

Ohmmeters work by passing a small current through the component and measuring the voltage produced.

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