题目内容

I don't know when he , but when he , I'll let you know.

A. will come/comes
B. comes/will come
C. comes/comes
D. will come/will come

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Every time I _____ there, I will buy him something nice.

A. went
B. will go
C. go
D. have gone

Iwastoldthatthepressconference heldthenextday.

A. were tobe
B. has tobe
C. istobe
D. wastobe

常用螺纹联接中，自锁性最好的螺纹是。

A. 三角螺纹(普通螺纹）
B. 梯形螺纹
C. 锯齿形螺纹
D. 矩形螺纹

一螺纹的标记为 M20×2LH 6H则其螺距为mm