试题与答案

某地铁轨道交通项目,该区段道路两侧地下管线纵横交错,数目较多,其中有电信管线、给水管

题型:问答题

题目:


某地铁轨道交通项目,该区段道路两侧地下管线纵横交错,数目较多,其中有电信管线、给水管线、电力管线、排水管线和煤气管线等;项目处于交通干道,交通繁忙,不能封路施工。因此只能采用暗挖法施工。
轨道工程的折返线长度为147.8m,冻结开挖长度为140m,隧道顶面距离地表最小约为8m。隧道净断面为马蹄形,隧道净高9146mm,净宽111400mm。隧道临时支护为厚350mm的C20格栅钢架网喷混凝土,内衬为厚450mm的C30S8模筑钢筋混凝土。
[问题]

简述营运期电磁辐射对环境的影响以及相应的环保措施。

答案:

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                                                 Wetlands! Valuable Resources on the Earth

    There are many wetlands in China and some of them have become the world's important wetlands. The

Chinese Yellow Sea Wetlands are among them. They are in Yancheng, Jiangsu Province. They are home for

many different kinds of animals. The world's largest Milu Deer Nature Reserve is in them. More than 700

Milu deer live freely there. There are not many red-crowned cranes in the world, but every winter you can

see some in the Red-crowned Crane Nature Reserve in the Yellow Sea Wetlands.

    The temperature in the wetlands is usually neither too high nor too low. There us a lot of rain and sunshine,

too. They are really good places for wildlife. Offering (提供) food and home for some special kinds of animals

is not the only reason why we need to protect wetlands. Wetlands are important because they also prevent

flood. But some people want to change the wetlands to make more space for farms and less space for wildlife.

Luckily, more and more people are beginning to realize the importance of wetlands and wildlife. Every year, on

February 2nd, many activities are held to tell people more about wetlands.

1. The Chinese Yellow Sea Wetlands are in the ______ of China. [ ]

A. east

B. south

C. west

D. north

2. Usually the weather in the wetlands is ______. [ ]

A. hot

B. pleasant

C. cold

D. dry

3. The World Wetlands Day is on ______.[ ]

A. April 22

B. June 25

C. February 2

D. March 22

4. We must protect wetlands because ______.[ ]

A. they are home for wildlife

B. they can offer food to animals

C. they can prevent flood

D. all of the above

5. Some people want to change ______ to make more space for farms. [ ]

A. lands

B. world

C. wildlife

D. wetlands

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