上唇缺损占全唇多长时即可应用扇形皮瓣修复A．3/4以上B．1/4以上C．1/2以上D

实验室常用下列装置制取气体，我能根据所学知识回答下列问题。

⑴ 用A装置制取某种气体的一个化学方程式为_____________。

⑵ 实验室用过氧化氢溶液和二氧化锰粉末混合制取氧气，我不选B而选用C做气体发生装置，其优点是___________。

⑶ 汽车尾气中的一氧化氮是一种大气污染物。它是一种无色气体，难溶于水，密度比空气略大，在空气中能与氧气迅速反应生成红棕色的二氧化氮气体。实验室中制取一氧化氮采用的收集装置是（填序号）_________。我认为选择气体收集方法，从气体性质的角度需要考虑的因素是：_______________。

⑷ 在医院里给病人输氧时，在氧气钢瓶和病人吸氧器之间连接一个类似下图所示的装置，在装置中盛放大约半瓶蒸馏水，导气管_________（填“a”或“b”）端连接在供氧气的钢瓶上，该装置的作用有（填写一条）__________________。

Many years ago，when I was fresh out of school and working in Denver，I was driving to my parents’ home in Missouri for Christmas. I stopped at a gas station(加油站) about 50 miles from Oklahoma City，where I was planning to stop and visit a friend. While I was standing in line at the cash register(收款台)，I said hello to an older couple who were also paying for gas.

I took off，but had gone only a few miles when black smoke poured from the back of my car. I stopped and wondered what I should do. A car pulled up behind me. It was the couple I had spoken to at the gas station. They said they would take me to my friend’s. We chatted on the way into the city，and when I got out of the car，the husband gave me his business card.

I wrote him and his wife a thank­you note for helping me. Soon afterward，I received a Christmas present from them. Their note that came with it said that helping me had made their holidays meaningful.

Years later，I drove to a meeting in a nearby town in the morning. In late afternoon I returned to my car and found that I’d left the lights on all day，and the battery(电池) was dead. Then I noticed that the Friendly Ford dealership—a shop selling cars—was right next door. I walked over and found two salesmen in the showroom.

“Just how friendly is Friendly Ford？” I asked and explained my trouble. They quickly drove a pickup truck to my car and started it. They would accept no payment，so when I got home，I wrote them a note to say thanks. I received a letter back from one of the salesmen. No one had ever taken the time to write him and say thank you，and it meant a lot，he said.

“Thank you” — two powerful words. They’re easy to say and mean so much.

小题1:

The author planned to stop at Oklahoma City________.

A．to visit a friend

B．to see his parents

C．to pay at the cash register

D．to have more gas for his car小题2:

The words “took off” underlined in Paragraph 2 mean “________”．

A．turned off

B．moved off

C．put up

D．set up小题3:

What happened when the author found smoke coming out of his car?

A．He had it pulled back to the gas station.

B．The couple sent him a business card.

C．The couple offered to help him.

D．He called his friend for help.小题4:

The battery of the author’s car was dead because________.

A．something went wrong with the lights

B．the meeting lasted a whole day

C．he forgot to turn off the lights

D．he drove too long a distance小题5:

By telling his own experiences，the author tries to show ________.

A．how to write a thank­you letter

B．how to deal with car problems

C．the kind­heartedness of older people

D．the importance of expressing thanks

左图所示对称刚架受同向结点力偶作用，弯矩图的正确形状是右侧四个图中的：（）

A.A

B.B

C.C

D.D

施工升降机地面防护围栏的高度不应低于（）m。

A.1

B.1.2

C.1.6

D.1.8

监理员应按被授予的职责权限开展监理工作，其主要职责应包括以下（）各项。

A.检查并记录现场施工程序、施工方法等实施过程情况

B.检查和统计计日工情况。核实工程计量结果

C.提出变更.索赔及质量和安全事故处理等方面的初步意见

D.检查承包单位的施工日志和试验室记录

E.核实承包单位质量评定的相关原始记录