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水压的试验目的？试画出水压实验装置示意图。

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地脚螺栓有哪几种类型？怎么进行安装？

---Your English is excellent!

A. ---Thank you
B. ---Just so so
C. ---No,my English is poor
D. ---You are right

---Hi,Peter!Shall we go out for a picnic this weekend?

A. ---No,thanks.
B. ---Yes,please.
C. ---Good idea.
D. ---Never mind.

---Remember to call me when you arrive.---OK,___________.

A. I must.
B. I will.
C. I should.
D. I can.