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【单选题】
将质量为m的质点以速度v铅直上抛,则质点从开始上抛到回到原处的过程中,质点动量的改变量为( )
A.
其改变量为mv,↓
B.
起改变量为2mv,↑
C.
没有改变
D.
其改变量为2mv,↓
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