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15. 下面对质点的描述正确的是( )。 ① 质点是忽略其大小和形状,具有空间位臵和整个物体质量的点;②质点可近视认为成微观粒子;③大物体可看作是由大量质点组成;④地球不能当作一个质点来处理,只能认为是有大量质点的组合;⑤在自然界中,可以找到实际的质点。

单选题
2021-09-01 19:09
A、①②③
B、②④⑤
C、①③
D、①②③④
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正确答案
C

试题解析

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