解释为何双面先后加压比单面加压方式更好

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问题问答题简答题

解释为何双面先后加压比单面加压方式更好

答案

参考答案：

（1）单面加压时，坯体中不但有低压区，还有死角。

（2）双面先后加压，两次加压之间有间歇，利于空气排出，使整个坯体压力与密度都较均匀

填空题

用所给词的适当形式填空。

1. This dog is very ______________(love) and I like it very much.

2. Who does ___________(good) in English, John or Mike?

3. I hope to spend two hours _______ (play) softball with him.

4. Students can have _________________ (drive) lessons in American schools .

5. At the ____________ (begin) of the trip, most of us felt bored.

6. My mother always cooks ___________ (taste) meals on Sunday.

7. It rained heavily yesterday, so my father (drive) me to school.

8. The girls finished their work all by______________(them).

9. Yesterday we had a good time _______(chat)with each other.

10.I plan ( go ) to Beijing for summer holiday next year .

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对于维修项目的实施，水管单位要建立（）体系。

A.质量保证

B.质量奖惩

C.质量管理

D.质量监督