题目内容

________ forward, optimistic people often have more hope and believe they will embrace more chance.

A. look
B. having looked
C. looking
D. to look

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One of the I did is that I got to know all these lovely friends.

A. happy thing
B. best things
C. good experience
D. most difficult things

巴氏合金通常用于作滑动轴承的。

A. 轴套
B. 轴承衬
C. 含油轴瓦
D. 轴承座

不是滑动轴承的特点。

A. 启动力矩小
B. 对轴承材料要求高
C. 供油系统复杂
D. 高、低速运转性能均好

宽径比B/d是设计滑动轴承时首先确定的重要参数之一，通常取B/d= 。

A. 1～10
B. 0.1～1
C. 0.4～2
D. 3～5