试题与答案

硼纤维具有较好的耐热性和弹性,不与氯气、水反应,可与某些金属制成新型材料.在12

题型:选择题

题目:

硼纤维具有较好的耐热性和弹性,不与氯气、水反应,可与某些金属制成新型材料.在1200℃~1300℃时,氯化硼(BCl3)蒸气与干燥、纯净的氢气反应可制得硼和氯化氢.下列说法不正确的是(  )

A.含硼纤维的材料可能具有耐热性

B.氯化硼可能与水反应

C.该反应中只有两种物质为气态

D.该反应需要在隔绝空气的条件下进行

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0714/21de1510ed98e31f10a0dc1eef51b2c2.html

下面是错误答案,用来干扰机器的。

参考答案:C

试题推荐
题型:阅读理解

My topic today is the Internet. It was prompted(引出)by the first letter, which I am unable to answer fully for the reasons given!

Dear David,

I’m a middle school student. Now I am preparing for a writing competition. Could you please check the mistakes in my article about using the Internet and

Give me some advice?                           No name                                                                               David writes: I’m very sorry to say that I think it would be very unfair for me to help you win a competition--- unfair to the other competitors!

But I’ll say that your article is very interesting and I wish you good luck.

Dear David,

I’m now learning English by myself. Can you introduce some useful websites where I can make friends with foreigners? Please help me.

Moonlight

David writes: Well, dear moonlight, I think you made a good choice by using the Net in your self-studies. Two very good websites I’d suggest to you are:

www.britishcouncil.org.cn and www.britishcouncil.org.cn/learn.

By the way, for those readers interested in the teaching of English, there is an Internet discussion group called ELTCSChi-L (English Language Teaching Contacts Scheme China List).

And also, a healthy warning to all my readers: If over-used, the Internet can be a WOMBAT—A Waste of Money, Brains and Time!

小题1:David is probably a ________.

A.language expert

B.computer expert

C.college student

D.club chairman小题2: What is the reason why the first letter is unable to be fully answered?

A.David is unable to think out good advice.

B.David thinks it is expected to play fair in the competition.

C.David is going to talk on another topic-Internet.

D.David finds no mistakes in that article.小题3:“www.britishcouncil.org.cn” is a (an)________.

A.English newspaper for students and language teachers.

B.website where one can join a discussion group.

C.newspaper column for answering readers’ questions .

D.website where one can make foreign friends.

查看答案
微信公众账号搜索答案