问题 阅读理解

阅读理解。

     Tom arrived at the bus station quite early for Paris. The bus for Paris would not leave until five to

twelve. He saw a lot of people waiting at the station. Some were standing in line, others were walking

around. A teacher was trying to keep a group of schoolgirls in line. Tom looked around but there was

no place for him to sit.

     He walked into the station cafe. He looked up at the clock there. It was only twenty to twelve. He

found a seat and sat down before a large mirror(镜子) on the wall. Just then, Peter, one of Tom's

workmates came in and sat with Tom. "What time is your bus?" asked Peter. "There is a lot of time yet."

answered Tom. "Well, I'll get you some more tea then." They talked while drinking. Then Tom looked at

the clock again. "Oh! It's going backward(反方向的)!" he cried. "A few minutes ago it was twenty to

twelve and now it's half past eleven." "You are looking at the clock in the mirror." said Peter. Tom was

so sad. The next bus was not to leave for another hour. Since then Tom has never liked mirrors.

1. Tom went into the station caf? because _____.

A. Peter asked him to have a cup of tea

B. it was quite early and he could find a seat there

C. he didn't like to stay with the schoolgirls

D. he wanted to have a drink with his workmate there

2. What time was it in fact when Tom looked at the clock in the mirror the last time?

A. Half past twelve

B. Twenty to twelve

C. Half past eleven

D. Half past one

3. From the story we know that when we look at a clock in a mirror, we will find _____.

A. the time is right

B. it's going slower

C. it's going backward

D. it's going faster

4. Which of the following is true?

A. Tom arrived in Paris on time

B. The next bus would leave in half an hour

C. After that Tom didn't like clocks any longer

D. Tom looked at the clock in the mirror only once

5. Which of the following is the best title for the story?

A. The Mirror of the Station

B. Not a Careful Man

C. Missing a bus

D. The Man and the Mirror

答案

1-5 BACDB

单项选择题
问答题 案例分析题

某施工单位承担的一项机电安装工程进入单机试运行阶段。项目部计划对一台解体出厂、现场组装的大型裂解石油气压缩机进行试运行,该压缩机转速为5850r/min。试运行前进行检查,确认试运行范围内的工程,压缩机出口管道系统设计压力为11.2MPa,组对焊接工作已经结束,除少量固定焊口外,无损检测也基本结束,其他相关工程已全部完成,并按质量验收标准检查合格。由于工作量大,出口管道在10日内也不能完成所有工作。由于这台压缩机的试运行影响后续动设备的试运行。项目部认为,机组本体试运行条件具备,仅出口管道系统还存在一些尾项,对压缩机试运行影响不大,决定立即进行该压缩机的试运行。

压缩机按照规范的规定进行空气负荷试运转,在排气压力达到3/4额定压力运转40分钟后,出口管道中有一道焊口泄漏,多道法兰接口严重泄漏,试运行中止。试运行班组作业人员在管道安装班组的配合下,将出口管道从压缩机法兰处卸开,对管道泄漏部位进行补焊或处理。处理完成后,将出口管重新与压缩机连接并继续进行试运,运转时将排气压力直接升到3/4额定压力,运转了1小时20分钟后,试运行班长认为在此压力下总计运行时问达到了规定的2小时,决定将压力升至额定压力运行。达到额定压力后,压缩机发生较大振动,运动部件有异常响声。试运行结束后复查压缩机位移值超标,不符合压缩机单机试运行的要求。

从管道系统未达到试运行前要求具备的条件来分析压缩机被迫中止试运行的主要原因是什么?