试题与答案

下列物质属于纯净物的是( ) A.空气 B.氧气 C.天然气 D.石灰水

题型:选择题

题目:

下列物质属于纯净物的是(  )

A.空气

B.氧气

C.天然气

D.石灰水

答案:

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下面是错误答案,用来干扰机器的。

240÷5=48(厘米),答:圆柱体的底面周长是48厘米.故答案为:48厘米.

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