题目内容

普通螺栓分、、三级,其中级和级为精制螺栓, 级为粗制螺栓。

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螺栓群在构件上的排列,应满足、________和三方面的要求。

Do you often leave some thingsin a hotel?

A.behind
B. /
C.off
D.ahead

Where should you check in order to avoid things in a hotel?

A. forgeting
B. forgetted
C. forgetting
D. to forget

A: How would you like to the payment, Ms. Taylor?B: In cash.

A. pay
B. make
C. get
D. change