题目内容

If I _________ his email address, I would have sent him a message yesterday.

A. have know
B. had known
C. will know
D. know

查看答案

搜索结果不匹配？点我反馈

更多问题

John spent a lot of time ________to his colleagues how challenging the project was.

A. explain
B. explaining
C. to explain
D. explained

It is the high efficiency of the new equipment ___ has increasingly attracted our attention.

A. which
B. what
C. that
D. who

摩擦型带传动是依靠()来传递运动和动力的。

A. 带和带轮接触面之间的正压力
B. 带与带轮之间的摩擦力
C. 带的紧边拉力

即将打滑时,传动带所能传递的最大有效拉力Ftmax和()有关系。

A. 带的长度
B. 带轮的直径
C. 带在带轮上的包角
D. 带的重量