问题 问答题 简答题

简述永久铺设的准备工作

答案

参考答案:

(1)按巷道施工图纸,检查巷道净断面是否满足行车安全间距的要求,不够者要进行处理。

(2)按设计要求标定巷道中腰线,标出轨道中心线、圆曲线起止点、道岔中心及纵断面的变坡点,并进行水品测量。(3)对施工中所需材料的数量、规格、质量应全面检查,并按计划提前运到施工地点。为使钢轨在直线段上实行对接,同一长度钢轨编号排列,且排放整齐。(4)检查巷道的排水设施是否完好、齐全。

5)拆除临时轨道,并把道床上的杂物清除干净,为永久轨道的铺设做好准备。

阅读理解

Many people watched the lift-off of the space shuttle Columbia on March 21, 1982. But none watched more closely than eighteen-year-old Ted, as Ted’s insects were on board the shuttle.

The Shuttle Student Involvement Program invited students to make a science experiment. The experiment would be done by astronauts on the space shuttle.

Ted had always been interested in space and flight. Insect flight especially interested him. Ted noticed that insects need gravity to take off and land. They need gravity to fly in a straight line. But in space, there is no gravity. Could insects fly in zero gravity? That is what Ted wanted to find out.

Ted made an experiment called “Insect in Flight Motion Study”. He entered his experiment and soon news came that it was a winner.

A large team of scientists and engineers helped Ted get his experiment ready to fly. There were many questions to be answered first. What kind of insects would Ted use in his experiment? The insects would have to be strong enough to live on the shuttle for nine days without much food. What kind of container would hold the insects? Would the insects die during the shuttle flight?

After months of hard work, the “insectronauts” were chosen. A group of moths, flies, and honeybees were put into a special box and put onto the space shuttle. When Columbia flew into space, it was carrying insect passengers.

On March 24, astronauts Gordon Fullerton and Jack Lousma took out the box that held the insects. They began filming the insects with a special video camera.

When the space shuttle landed Ted was able to watch the video film of insects. Just as he thought, most of the insects did have trouble flying in zero gravity. The flies did well. But the moths’ flight seemed “uncontrolled”. They would often just hang in the air. The bees had the most trouble. They couldn’t fly at all! The film showed bees spinning around in all directions. Others were just floating about in the box.

Ted learned the answer to his question about insects’ flight in zero gravity. But he also learned a lot more. He learned about the hard work needed in making a successful experiment.

小题1:What does the underlined sentence “it was a winner” mean?

A.Ted could fly in space.

B.Ted won a prize.

C.Ted’s experiment was accepted.

D.Ted won in a race.小题2:What did Ted want to find out?

A.Whether the insects could fly in space.

B.Whether the insects could fly in a straight line.

C.Whether the insects could land after flying for a while.

D.Whether the insects could take off after resting for a while.小题3:Of the three kinds of insects sent into space, which one flew worst in zero gravity?

A.The flies.

B.The honeybees.

C.The insects.

D.The moths.小题4:Who did the experiment?

A.Ted himself.

B.Ted’s friend.

C.A large team of scientists and engineers.

D.Two astronauts on the space shuttle.小题5:How did Ted learn the answer to his question about insects’ flight in zero gravity?

A.By asking the scientists and engineers.

B.By studying a book written by the astronauts.

C.By going into space and watching the insects’ flight himself.

D.By watching the video film made by the astronauts.

解答题