【題目】關(guān)于力學(xué)單位制，下列說法中正確的是

A．kg、m、N是基本單位

B．kg、N、m/s都是導(dǎo)出單位

C．在國際單位制中，牛頓第二定律的表達式才是F=ma

D．在國際單位制中，質(zhì)量的基本單位是kg，也可以是g

【答案】C

【解析】

試題分析：N不是基本單位，A錯誤；kg是基本單位不是導(dǎo)出單位，B錯誤；在國際單位制中，牛頓第二定律的表達式才是F=ma，否則k不等于1，C正確；在國際單位制中，質(zhì)量的單位是kg,D錯誤。

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