题目内容

The ________ from childhood to adulthood is always critical time for everybody.

A. conversion
B. transition
C. turnover
D. transformation

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_______ efforts are needed in order to finish important but unpleasant tasks.

A. consecutive
B. condensed
C. perpetual
D. persistent

滚子式从动杆的滚子____选用的过大,将会使运动规律“失真”。

凸轮机构中的压力角是指____间所夹的锐角。

在凸轮机构中,从动杆的____称为行程。