三氯化氮(NCl3)是一种淡黄色的油状液体.测得其分子具有三角锥形结构。则下面对

题型:选择题

问题:

三氯化氮(NCl3)是一种淡黄色的油状液体.测得其分子具有三角锥形结构。则下面对于NCl3的描述不正确的是 [ ]

A.它是一种极性分子

B.它的挥发性比PBr3要大

C.它还能再以配位键与Cl结合

D.已知NBr3对光敏感,所以NCl3对光也敏感

考点:极性分子、非极性分子配位键
题型:选择题

甲、乙两家施工单位的资质分别为一级、二级,两家组成联合体,共同招标一项工程,甲、乙签订的联合投标协议约定:如果在施工的过程中出现质量问题遭遇建设单位的索赔,各自承担索赔额的50%。后来在施工的过程中由于乙公司的施工技术问题至使工程出现了质量问题,并因此遭到了建设单位的索赔,索赔额为18万元。建设单位找甲施工单位索要全部赔偿款18万元,甲施工单位拒绝建设单位的要求,只答应付9万元。

工程转包是指将( )。

A.工程的部分交由其他单位完成

B.一部分工程交由其他单位完成

C.所有工程全部交由其他单位完成

D.全部建筑工程转包给他人

题型:选择题

阅读理解。

     Are you the only child in the family? If so, you are the most important in your family. Parents are the

closest people to you in the world. But a lot of middle school students have a problem. They feel they're not

as close to their parents as before. They even don't think their parents are fair (公平的) to them.

     Some students complain that their parents often say a lot to them, but never listen to them. Some say their

parents don't allow them to play computer games when other classmates are doing that. Others say when

they're making phone calls to friends, their parents like to ask if they're speaking to a boy or a girl. These make

them very unhappy. Some students even decide to leave home because they're afraid to tell their parents when

they have done something wrong, especially when they do badly in exams. Then they usually think running

away is the only choice (选择). But they don't know running away may bring them some more problems.

     Problems are parts of life. Here are some suggestions for you to solve your problems.

    1) Find a good chance to talk with your parents. Don't be afraid to tell them your feelings.

    2)Get help from others like good friends or teachers.

    3)Keep a diary to help you understand more about yourself and your feelings.

    4)Show your parents you' re growing up. Then they'll feel you' re no longer a small child. If you follow

the advice, you'll have a happy life and never think of running away.

1. According to the article, ________ are the closest people to an only child.

A. teachers

B. classmates

C. parents

2. Which of the following is TRUE?

A. Parents don't love their children now.

B. Middle school students don't have any problems.

C. Some students don't think their parents are fair to them.

3. We'd better ________ if we have problems with them.

A. talk with our parents

B. quarrel with our parents

C. leave our parents

4. Why does the author advice us to keep a diary?

A. Because it's our homework.

B. Because it can help us practice writing.

C. Because it can help us understand ourselves better.

5. This article is about some middle school students' ________.

A. friends

B. hobbies

C. problems

题型:选择题

广义地说来,凡是故事,都以叙述()为主。

题型:选择题

在OSI参考模型中,提供统一网络数据表示功能的是()。

A.数据链路层

B.网络层

C.会话层

D.表示层

题型:选择题

心室收缩时()

A.左房室瓣关闭

B.右房室瓣关闭

C.主动脉瓣开放

D.肺动脉瓣开放

E.血液射入动脉

更多题库