【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(dá)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(dá)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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