题目内容

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

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

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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

螺纹联接常用的防松方法有、和。