问题 问答题 简答题

公路通信管道穿越道路、桥梁、电力管线如何保护?

答案

参考答案:

1、公路通信管道穿越道路采用镀锌钢管或采用玻璃纤维增强塑料(或薄钢板)制成的通信管箱方式。管道埋深(管道顶部至路面)应不小于0.8m,要求管道坡度与道路坡度一致。

2、公路通信管道穿越桥梁采用玻璃纤维增强塑料(或薄钢板)制成的通信管道方式,管箱中心线与桥梁的中心线相一致。当中央分隔带设有跨线桥中墩等构造物时,通信管箱采用两种办法通过:一是当中墩横断面宽度与中央分隔带宽度相接近时,预埋镀锌钢管穿越中墩;二是当中墩横断面宽度较小时,可采用高密度聚乙烯管(HDPE)紧贴中墩壁绕过中墩。此段通信管道应作混凝土包封保护,包封厚度大于或等于5cm。通信管道的横向外轮廓线与中央分隔带护栏柱的保护间距应大于15cm。3、公路通信管道穿越电力管线采用镀锌钢管或采用玻璃纤维增强塑料(或薄钢板)制成的通信管箱方式。垂直交叉的距离应大于或等于30cm。

阅读理解

“Look, Mom! What a pretty fish!" said John to his mother.

John’s mother asked, “Where did you get it, John?”

“Frank caught it in the river. I went to the river to get some water and saw this little fish. Then I told Frank about the fish, and he ran to get his fishnet (鱼网). He put the net into the water, and caught the fish. I put it into this box,”

“Well, what will you do with it?” asked John’s mother.

“I will keep it, Mom,” replied John.

“But, my boy, it will not live in that box. You should put it back into the river.” replied his mother.

John felt sad and said, “I wish I could keep it.  It is so pretty! May I put it into the pond?”

“No, John,” said his Mom, “you must put it into the river. A trout (鲑鱼) will not live in warm water.”

小题1:Who found the fish firstly?

A.John.

B.John’s mother.

C.Frank.

D.Frank’s mother.小题2:What did John want to do with the fish?

A.He wanted to give it to Frank.

B.He wanted to keep it.

C.He wanted to put it back into the river.

D.He wanted to cook it.小题3:Why can’t the fish live in the pond?

A.Because its mother lives in the river.

B.Because the water in the pond is dirty.

C.Because it can't live in warm water.

D.Because it likes living in a big place.小题4:What do you think will happen next in the story?

A.John will put the fish into the river.

B.The trout will change into a big fish.

C.John will take care of it at home.

D.The trout will die in the pond.小题5:We may read the article in a ______.

A.Magazine

B.comic book

C.cookbook

D.storybook

单项选择题 A1/A2型题