取下列四种气态烃各1g,分别在足量的氧气中燃烧,消耗氧气最多的是 A.CH4 B

题型:选择题

问题:

取下列四种气态烃各1g,分别在足量的氧气中燃烧,消耗氧气最多的是

A.CH4

B.C2H6

C.C3H8

D.C4H10

考点:烷烃的通性环烷烃(环己烷、环丙烷等)乙烯
题型:选择题

阅读短文,选择正确答案。

      Welcome to China, we'll invite you to eat the real Chinese food-dumplings. In China, there are many

different kinds of food. Some of them are very popular. The real Chinese food is dumplings. Now let's talk

about them, OK?

      Everyone in China likes dumplings very much, and there are many different kinds of dumplings. Some have

meat and vegetables in them; others have sugar, eggs and so on. I like dumplings with vegetables and pork better

than any other kind.

      Usually people make dumplings at home. If you have no time to make them, you can buy them from any

supermarket. Then you take them home and eat them with vinegar. The Spring Festival is very important in

China. When it comes, we make dumplings; usually we put a coin in a dumpling. If one eats the dumpling with

the coin in it, he or she will be lucky in the year.

      In the old days, people couldn't often eat dumplings because they were very poor. Now our country is

becoming stronger and stronger, and our people are richer and richer. We can eat them very often.

      Now tell me, do you like dumplings? What kind of dumplings do you like?

      And to our surprise, many foreigners have problems making dumplings, so they go to Chinese restaurants

to eat dumplings, not make at home. They also like eating dumplings.

1. In China, the real Chinese food is ________. [ ]

A. noodles

B. moon cakes

C. vegetables

D. dumplings

2. The author (作者) likes dumplings with _______ best. [ ]

A. meat

B. seafood

C. vegetables and pork

D. vegetables

3. If you want to eat dumplings, you can do all the following things except ________. [ ]

A. make dumplings at home

B. go to visit the foreigners

C. buy dumplings from any supermarket.

D. go to a restaurant

4. Which of the sentences is NOT true? ________ [ ]

A. In the old days, people often eat dumplings because they are poor.

B. If one eats the dumpling with the coin in it, he will be lucky in the year.

C. The Chinese like dumplings very much.

D. Now people are richer and richer and they can eat dumplings at any time if they like.

题型:选择题

当介质温度( )时,为高温管道。

A.高于450℃

B.大于等于450℃

C.大于等于420℃

D.大于450℃,小于600℃

题型:选择题

近代中国,一些爱国人士提出过工业救国、教育救国、科学救国等主张,并为此进行过努力,但这些主张并不能从根本上给濒临危亡的中国指明正确的出路,这是因为他们没有认识到()

A.争取民族独立和人民解放是实现民族复兴的前提

B.中国已经被卷入世界资本主义经济体系和世界市场中

C.中国是一个经济政治发展不平衡的国家

D.资本主义制度已经过时

题型:选择题

以下机构中,( )不属于行政决策咨询系统。

A.河北省政府设立的政策研究室

B.国务院研究室

C.国家高级领导人的专家参谋集团

D.农业部办公厅的综合处

题型:选择题

两组分混合液萃取分离时,在萃取相中有()组分

A.2个

B.3个

C.4个

D.1个

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