水工隧洞的衬砌有什么作用?

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问题:

水工隧洞的衬砌有什么作用?

考点:水利工程水工建筑物水工建筑物题库
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2 ×3+3和3×3的计算过程不同,得数也不同。[ ]

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阅读下面短文,根据短文内容用方框内所给词汇或短语的适当形式填空,使短文语义完整。(温馨提示:一定要注意词语的形式变化!)
One  put up  so  also  way  from  can  be  wall
 
One day, when Bill was    小题1:  home from school, he heard a noise coming from the bushes(灌木).He went over to see   小题2:   it was. Behind a bush, he found a black dog. Bill went back home as soon as he    小题3:   with the dog and showed her to his parents. Bill's dad found that the dog had a broken leg,    小题4:   they brought the dog to a doctor for animals by car. On the    小题5:   Bill's parents decided that Bill could keep the dog if they couldn't find the owner.
When they arrived,the doctor checked the dog. He told  Bill that she  小题6: going to have babies! The next day, Bill   小题7:   signs(牌子)like “FOUND DOG BLACK” around his neighborhood. He   小题8:   wrote his family's phone number on the signs.
Two days later, Bill got a call   小题9:   the owner of the dog. The owner thanked Bill. When he came to pick up his dog, he said Bill could have    小题10: of the babies. Bill was very happy! Finally Bill got a baby dog from the owner. He named him Rosco and liked him very much.
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把一个棱长为2cm的正方体全部锯成棱长为1cm的小正方体,表面积增加了______cm2

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净化饮用水常用的混凝剂是()

A.漂白粉

B.硫酸钙

C.硫酸铝

D.臭氧

E.硫代硫酸钠

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地方性斑疹伤寒的主要传染源是()

A.病人

B.野鼠

C.家鼠

D.病原携带者

E.隐性感染者

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