题目内容

These dogs ______ detect drugs.

A. are trained
B. is trained
C. are train to
D. are trained to

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I hope I ______ you in the future.

A. will meet
B. meet
C. met
D. have met

I would like ________ abroad, but my family can’t afford it.

A. study
B. to study
C. studying
D. studied

螺纹的自锁现象与（）无关。

A. 螺纹摩擦角
B. 螺纹的公称直径和导程
C. 螺纹制品重量

对内螺纹较深、树脂强度高、螺纹精度要求高的制品，必须采用（）的方法。

A. 强制脱螺纹
B. 旋转脱螺纹
C. 手动脱螺纹
D. 自动脱螺纹