基于米(长度)、克(重量)、秒(时间)和安培(电流)的一种测量单位公制系统。

A metric system of measurement units based upon the meter (length), gram (weight), second (time) and amperes (electrical current).

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在电工中，最常用的单位是用来测量电阻、电流、电压和功率等等。

In electrical work the most common units are for the measurement of resistance, current, voltage, electrical power and all that.

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