(10年云南玉溪5)下列有关粗盐提纯实验的部分操作中,不正确的是( ) A.取

题型:选择题

问题:

(10年云南玉溪5)下列有关粗盐提纯实验的部分操作中,不正确的是(  )

A.取一定量粗盐

B.溶解

C.过滤

D.蒸发

考点:测容器—量筒称量器—天平加热器皿—酒精灯常见仪器和装置的用途
题型:选择题

若正比例函数y=kx(k为常数,且k≠0)的函数值y随着x的增大而减小,则k的值可以是       .(写出一个即可)

题型:选择题

阅读理解。

    The most frightening words in the English language are, "Our computer is down." You hear it more and

more when you are on business. The other day I was at the airport waiting for a ticket to Washington and

the girl in the ticket office said, "I'm sorry, I can't sell you a ticket.Our computer is down."

     "If your computer is down, just write me out a ticket."

     "I can't write you out a ticket. The computer is the only one allowed to do so."

     I looked down on the computer and every passenger was just standing there drinking coffee and staring

at the black screen. Then I asked her, "What do all you people do?"

     "We give the computer the information about your trip, and then it tells us whether you can fly with us

or not."

      "So when it goes down, you go down with it."

      "That's good, sir."

      "How long will the computer be down?" I wanted to know.

      "I have no idea. Sometimes it's down for 10 minutes, sometimes for two hours. There's no way we can

find out without asking the computer, and since it's down it won't answer us."

      After the girl told me they had no backup (备用) computer, I said. "Let's forget the computer. What

about your planes? They're still flying, aren't they?"

      "I couldn't tell without asking the computer." 

      "Maybe I could just go to the gate and ask the pilot if he's flying to Washington," I suggested.

      "I wouldn't know what gate to send you to.Even if the pilot was going to Washington, he couldn't take

you if you didn't have a ticket."

      "Is there any other airline flying to Washington within the next few hours?"

      "I wouldn't know," she said, pointing at the dark screen. "Only 'IT' knows.'It' can't tell me."

      By this time there were quite a few people standing in lines. The word soon spread to other travelers that

the computer was down. Some people went white, some people started to cry and still others kicked their

luggage.

1. The best title for the article is _____. [ ]

A. When the Computer Is Down

B. The Most Frightening Words

C. The Computer of the Airport

D. Asking the Computer

2. What could the girl in the ticket office do for the passengers without asking the computer? [ ]

A. She could sell a ticket.

B. She could write out a ticket.

C. She could answer the passengers' questions.

D. She could do nothing.

3. Why do you think they had not a backup computer?[ ]

A. Because it was easy down

B. Because it was very expensive.

C. Because it was not advanced enough.

D. Because it was not as big as the main computer.

4. The last paragraph suggests that _____. [ ]

A. a modern computer won't be down.

B. computers can take the place of humans

C. sometimes a computer may bring suffering to people

D. there will be great changes in computers

题型:选择题

院前急救处理病人时遵循从头到脚的顺序最为可靠。

题型:选择题

郑西铁路客运专线2010年正式通车,西安至郑州只需2小时,西安至北京只需4小时。郑西客运专线是我国中长期铁路规划中10条客运专线中徐兰客运专线(徐州一郑州一西安一宝鸡一兰州)最先开工的一段。完成1~3题。

1、该铁路的建成体现了现代交通的高速化和[ ]

A、电气化

B、专业化

C、综合化

D、区域化

2、决定郑西铁路客运专线修建的主要区位因素是[ ]

A、政府政策因素

B、社会经济因素

C、筹建资金因素

D、地形地质因素

3、该铁路线建成的意义在于[ ]

A、加快西部经济区能源的开发

B、将西部资源优势转化为经济优势

C、促进三大经济区经济、文化和人才的交流

D、有利于西部生态环境的改善

题型:选择题

可影响癫痫发作的因素包括()

A.年龄

B.脑功能状态

C.遗传因素

D.内环境改变

E.睡眠

更多题库