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【单选题】
以下关于质点的说法中,正确的是()A.
质量很小的物体就可以当作质点
B.
质量很大或体积很大的物体一定不能看成质点
C.
体积很小的物体就可以看成质点
D.
同一物体有时可看作质点，有时不能看作质点
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