[题目]关于力学单位制.下列说法中正确的是A．kg.m.N是基本单位B．kg.N.m/s都是导出单位C．在国际单位制中.牛顿第二定律的表达式才是F=maD．在国际单位制中.质量的基本单位是kg.也可以是g 题目和参考答案——青夏教育精英家教网—

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【题目】关于力学单位制，下列说法中正确的是

A．kg、m、N是基本单位

B．kg、N、m/s都是导出单位

C．在国际单位制中，牛顿第二定律的表达式才是F=ma

D．在国际单位制中，质量的基本单位是kg，也可以是g

【答案】C

【解析】

试题分析：N不是基本单位，A错误；kg是基本单位不是导出单位，B错误；在国际单位制中，牛顿第二定律的表达式才是F=ma，否则k不等于1，C正确；在国际单位制中，质量的单位是kg,D错误。

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