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【多选题】
质点作曲线运动, r 表示位矢, s 表示路程, a τ 表示切向加速度大小,下列表 错误的有()
A.
d v /d t = a
B.
d r /d t = v
C.
d s /d t = v
D.
|d v /d t | = a τ
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A.
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A.
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A.
The secretary worked late into the night,preparing a long speech for the manager.
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C.
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