问题 问答题 论述题

论述减压围井(养水盆)的适用范围及其控制或消除管涌险情的原理。

答案

参考答案:

当缺乏反滤材料、临背水位差较小、高水位历时短、管涌周围地表较坚实完整且渗透性小时,可在管涌出口处抢筑无滤层围井(土袋井壁或利用无底桶、钢管做井壁)或在背水堤脚附近修筑围堤(也称月堤、围埝)以形成养水盆,将管涌圈在无滤层围井或养水盆中,靠抬高井(盆)内水位而减小临背水位差、减小渗透坡降,从而制止渗透破坏,以控制或消除管涌险情。

完形填空

If you visit a big city anywhere in the world,you will probably find a restaurant which serves the food of your native country.Most large   1  in the United States offer an international sample of   2  .Many people enjoy eating the food   3  other nations.This is probably one reason   4  there are so many different kinds of restaurants in the United States.A second is that Americans   5  from all the parts of the world.They enjoy tasting the foods of their   6 lands.

In the city of Detroit,  7  ,there are many people from Western Europe,Latin America  8  the Far East.There are many restaurants in Detroit  9  serve the foods of these areas.There are many

  10  international restaurants,too.Americans not only like the foods in these restaurants but also enjoy the chance to   11 understand the foreign people and their   12  of life.

One of   13  most common international restaurants to be   14  in the US is an Italian restaurant.The restaurant is a small business   15  by a single family.The mother of the   16 

cooks all the dishes and the   17  and children serve the customers who come to eat there.Or it may be a  18 restaurant which can   19  many customers during one evening.So a restaurant may be owned   20  one family,one person,or by several different people who work together in the business.

1.A.cities                      B.countryside                C.nations                      D.families

2.A.waiters                   B.restaurants                 C.foods                        D.cooks

3.A.about                            B.of                             C.on                                   D.with

4.A.as                          B.when                        C.which                      D.why

5.A.arrive                     B.come                        C.go                                   D.leave

6.A.garden                   B.country                            C.state                          D.native

7.A.as                          B.like                           C.for example               D.such as

8.A.and                        B.with                          C.of                             D.then

9.A.where                    B.which                       C.when                        D.why

10.A.other                    B.others                       C.another                            D.other’s

11.A.worse                   B.better                        C.hardly                       D.more

12.A.hope                    B.wish                         C.place                         D.way

13.A.the                       B.a                              C.this                           D.that

14.A.cooked                 B.enjoyed                     C.found                        D.eaten

15.A.built                     B.run                           C.driven                       D.lived

16.A.family                  B.city                           C.business                    D.restaurant

17.A.mother                 B.guests                       C.visitors                      D.father

18.A.small                    B.large                         C.tiny                          D.bad

19.A.deal                            B.work                         C.serve                         D.prepare

20.A.by                        B.with                          C.of                             D.for

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