题目内容

()today, he would get there by Saturday.

A. Would he leave
B. Was he leaving
C. Were he to leave
D. if he leaves

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液压滑台的组成不包括( )这部分装置

A. 滑座
B. 滑台体
C. 传动装置
D. 液压缸

They considered()impossible to get everything ready in such a short time.

A. what
B. that
C. it
D. them

在表面加工顺序安排的原则中,( )是错误的

A. 先粗后精
B. 先次后主
C. 先主后次
D. 先基准面后其他

造成机械热变形的主要因素是机械表面存在( )。

A. 温差
B. 应力
C. 摩擦力

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