可燃气体包括（）等。 A.氧气 B.氦气 C.甲烷 D.氮气

用稀盐酸和锌粒反应制取氢气时，常混有氯化氢、水蒸气等杂质，为证明并排除杂质，制得纯净、干燥的氢气．根据下面装置图回答有关问题：

（1）写出稀盐酸与锌粒反应的化学方程式______

（2）B装置中所发生的现象是______，其作用是______

（3）C瓶中所发生的现象是______，其作用是______．

下列关于调压站布置原则的表述，错误的是（）。

A.调压站供气半径以0.5km为宜，当用户分布较散或供气区域狭长时，可考虑适当减小供气半径

B.调压站应尽量布置在负荷中心

C.调压站应避开人流量大的地区，并尽量减少对景观环境的影响

D.调压站布局时应保证必要的防护距离

直接观察法

阅读理解

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

to twelve. He saw a lot of people waiting in the station. Some were standing in line(排队), others were

walking around. There was a group of schoolgirls. Their teacher was trying to keep them in line. Tom

looked around but there was no place for him to sit.

    He walked into the station cafe(咖啡馆). 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, Mike, one of

Tom's workmates came in and sat with Tom.

    "What time is your bus " asked Mike.

     "There's plenty of time yet," answered Tom.

     "Well, I'll get you some more tea then," said Mike.

     They talked while drinking. Then Tom looked at the clock again. "Oh! It's going backward(倒行)!"

he cried. "A few minutes ago it was twenty to twelve and now it's half past eleven."

     "You're looking at the clock in the mirror." said Mike. Tom was so sad(难过). The next bus was not

to leave for another hour. Since then Tom has never liked mirrors.

1. Tom went into the station cafe because______________ .

A. Mike 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? 

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 title(题目) of the story? 

A. The Mirror of the Station        

B. Not A Careful Man

C. Missing A Bus                

D. The Clock In The Mirror

审计报告按照详略程度可以分为______。

A．简式审计报告和详式审计报告

B．评估报告和验资报告

C．审计组的审计报告和审计机关的审计报告

D．标准审计报告和非标准审计报告