某有机物甲经氧化后得乙(分子式为C2H3O2Cl);而甲经水解可得丙,1摩丙和2

题型:选择题

问题:

某有机物甲经氧化后得乙(分子式为C2H3O2Cl);而甲经水解可得丙,1摩丙和2摩乙反应得一种含氯的酯(C6H8O4Cl2).由此推断甲的结构简式为(  )

A.ClCH2CH2OH

B.OHC-O-CH2Cl

C.CH2ClCHO

D.HOCH2CH2OH

考点:酯化反应加聚反应缩聚反应
题型:选择题

抗战胜利后,由于美国商品排挤国货和官僚资本的挤压民族企业,民族工业日益萎缩、陷于绝境。[ ]

题型:选择题

阅读理解

     The crowd cheered as the young man walked across the stage to receive his award as the company's

top producer. He looked over the audience and trembled, and there was a clear pause that brought a

silence to the room. It took him a moment to control himself.

     "The last three months hit me pretty hard," he began. "And I feel the need to share a piece of my story

though I'm not sure why. A friend called me about his new marketing system, an outbound  (发往外国

的) fax(传真)service that could reach thousands of potential customers at very little cost. I checked it out, got excited and accepted it. After thousands of faxes, it seemed that what I did was illegal . I was

punished a dollar for every one sent out.

     The crowd was surprised.

     "I failed to do proper research, and didn't pay attention to the details. Now I am heavily in debt. As

some of you know, I recently move up here from down south. I stored my stuff (资料)in my old office,

which I closed down. When I drove back to pick it all up, I found that everything except my computer

and the clothes I brought with me was gone."

     He continued, "I drive a sports car. I love that car. One day while driving it, I stepped on the

accelerator (油门), lost control at 85 miles an hour, and hit the guard rail. I damaged my car very badly."

     "In three months, I got charged, lost everything I owned, and damaged my car. We all face challenges," he smiled. "I guess I wanted to share mine with you. Thanks for listening. " He left to a standing ovation

(鼓掌).

     Standing in the back of the room, I realized how much respect that young man earned. He faced his

fear, publicly admitted his mistakes and never gave up, in spite of the difficulties. That day, he won much

more than a trophy (奖杯).

1. According to the first paragraph, which word can describe the young man?

A. Calm.        

B. Brave.          

C. Shy.            

D. Nervous.

2. Why was the young man punished?

A. He made a serious mistake in his research.

B. He illegally sent faxes to customers.

C. He stole a computer from an office.

D. He drove his car at a high speed.

3.  The young man told his experiences perhaps to _________.  

          .

A. encourage others to face challenges bravely  

B. let the audience forgive him

C. show his misunderstanding of the law

D. complain about being treated unfairly

题型:选择题

直接融资中最常见的是( ),有时人们甚至把直接融资等同于证券市场融资,把发展直接融资市场等同于发展股票和债券市场。

A.货币融资
B.市场融资
C.实物融资
D.股票和债券融资

题型:选择题

促进教学方法发展的主要因素是( )

A.社会生产力
B.政治经济制度
C.上层建筑
D.意识形态

题型:选择题

男性,36岁,因肠梗阻频繁呕吐致等渗性缺水、低钾血症,经快速大量补液补钾盐后,觉全身感觉异常及心跳不齐。检查:血压90/60mmHg,脉搏50次/分。

如不及时治疗,最危险的后果是

A.心动过缓

B.昏迷

C.心脏骤停

D.心房颤动

更多题库