题目内容

滚动轴承的失效形式主要有、和磨损三种。

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滚动轴承中各元件所受载荷是一种应力。

The work proved to be more ___________ than being a solicitor.

A. satisfy
B. satisfying
C. satisfied
D. satisfaction

Joe felt _________ at having cheated the family.

A. fearful
B. relieved
C. guilty
D. desperate

Where is David? It’s already 9 o’clock. He _____ be at schoolbecause classes begin at 8.

A. can
B. can’t
C. may
D. must