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【单选题】
凸轮的压力角是在不考虑摩擦情况下,从动件受的作用力与从动件的( )方向的夹角。A.
法线
B.
速度
C.
加速度
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皮皮学刷刷变学霸
举一反三
【单选题】He said that the passenger _______ an accident; otherwise he would have arrived by that time
A.
must have
B.
must have had
C.
would have had
D.
should have had
【单选题】If we ________ one of the other uploading approaches, the process would have taken longer than one hour.
A.
used
B.
had used
C.
should use
D.
would use
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