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【单选题】
在周期性速度波动中,一个周期内等效驱动力做功 Wd 与等效阻力做功 W ́ r 的量值关系是
A.
Wd  < W ´ r
B.
Wd  =  W ´ r
C.
Wd  > W ´ r
D.
W d ≠ W ´ r
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