精英家教网 > 初中地理 > 题目详情

【题目】下列物质中属于混合物的是( )

A.氮气 B.二氧化碳

C.空气 D.氧气

【答案】C

【解析】

试题分析:空气是含有多种气体的混合物,没有独立的化学符号。

练习册系列答案
相关习题

科目:初中地理 来源: 题型:

【题目】D

A little dog stands near an old well(井). He stands there all morning. wow-wow! the little dog barks(吠叫). Bob hears him all the morning. 1 Why do you stand here, little dog? he asks. 2 The little dog looks at him. Bow-wow-wow! he barks again. 3 Come here, Frank. He says. A dog wants to tell us something. Ten minutes later, Frank arrives. 4 They see only a bone(骨头).

This is what the dog wants to tell us, says Frank. 5 The dog is very happy and runs away.

根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使短文意思通顺、内容完整,并将其标号填写在下面题号后的横线上。

A. Bob calls his brother Frank.

B. Then Frank gives the dog a bone.

C. At last Bob goes to the well.

D. And what are you barking at?

E. They look down into the well.

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】 This is the bike __________ my mother bought yesterday.

A. that B. who C. whom D. what

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】Art is _____ interesting subject.

A. a B. an C. the

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】

1watch, Tom, in, evening, the, doesn’t, TV

____________________________.

2favorite, what, is, your, sport

____________________________?

3because, art, like, I, it, interesting, is

_____________________________.

4he, have, does, on, Monday, geography

_____________________________?

5music , subject , favorite , is , his

_____________________________.

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】下列关于空气成分的叙述正确的是( )

A.空气中氮气和氧气的体积比约为41

B.空气的成分按质量计算,氮气占78%,氧气占21%

C.从液态空气中能分离出氮气,不能分离出氧气和稀有气体

D.空气中含量最多且性质又不活泼的是稀有气体

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】用符合题目要求的序号填空:

氧气;空气;二氧化碳;二氧化硫;五氧化二磷;四氧化三铁。

(1)通常状况下无色、无味的气体是________

(2)有刺激性气味并且污染空气的气体是________

(3)属于黑色固体的是________

(4)支持燃烧的气体是________

(5)属于白色固体的是________

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】 Im very __________ today because I have too much homework to do.

Really? That sounds boring.

A. relaxing B. busy C. free D. cool

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】生活中常见的下列物质,不属于溶液的是( )

A.糖水 B.蒸馏水

C.碘酒 D.汽水

查看答案和解析>>

同步练习册答案