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