试题与答案

国家建设部根据建筑施工企业管理的特点,确定建筑施工企业安全生产条件为13项。

题型:判断题

题目:

国家建设部根据建筑施工企业管理的特点,确定建筑施工企业安全生产条件为13项。

答案:

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阅读理解。

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friends there. He was a very busy man. He usually forgot something.

     When he was in the train, the conductor asked him for his ticket. Mark Twain looked for his ticket here

and there, but he couldn't find it. The conductor knew Mark Twain. He said, "Show me your ticket on your

way back. And if you can't find it, it doesn't matter.

     "Oh, but it does," said Mark Twain, "I must find the ticket. If I can't, how can I know where I am going?"

1. Mark Twain was a _____.

A. teacher

B. farmer

C. writer

D. conductor

2. Mark Twain went to the city _____.

A. by train

B. by car

C. by air

D. by ship

3. Mark Twain went to the city _____.

A. to buy some books

B. to see his friend

C. to see his parents

D. to see a film

4. When he was in the train, the conductor asked him for _____.

A. some books

B. some food

C. some help

D. his ticket

5. Mark Twain didn't show his ticket because _____.

A. he didn't like the conductor

B. the conductor didn't ask for it

C. he couldn't find it

D. he didn't buy the ticket at all

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题型:计算题

一列机车的质量是5×105kg,在水平平直轨道上由静止开始匀加速启动,加速度大小为0.4m/s2。已知机车的额定功率为3000kw,当机车由静止达到最大速率30m/s时,共用时t秒。行驶过程中阻力恒定,则:

(1)机车匀加速阶段的牵引力多大?

(2)匀加速阶段机车的实际功率等于额定功率时,机车的速度多大?

(3)机车由静止达到最大速度时,前进的距离是多少?(答案中可以包含字母t)

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