题目内容

【单选题】He received a(n) _______ call threatening to disclose details of his affair if he didn’t pay the money.

A. anonymous
B. synonymous
C. anonymity
D. synonym

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【单选题】The movie presents Lincoln as a strong-willed,_______ man who led the US through a moral, constitutional and political crisis.

A. conscious
B. conscientious
C. conscience
D. consciousness

【单选题】It is understandable that the health and welfare of their family is a(n) _______ concern for this young couple.

A. perpetual
B. integral
C. original
D. popular

活塞环的作用是（）。

A. 密封
B. 导热
C. 润滑
D. 传递动力

第一密封面的密封力来自于（）。

A. 活塞环弹力
B. 活塞环惯性力
C. 活塞环摩擦力
D. 气体背压