题目内容

We all hope __1 the 2008Olympic Gameswill be the best ever, and _2___ the athletes andvisitors will enjoy China and Beijing.

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At last the soldiers reached_____ the localscalled the Three Gorges.

Acomputer can only do_________ you have instructed it to do.

按照凸轮的形状可以分为()

A. 盘形
B. 移动
C. 圆柱
D. 槽形

凸轮轴的位置有()

A. 下置式
B. 中置式
C. 上置式