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【简答题】
根据氢气、氧气、一氧化碳、二氧化碳和甲烷五种气体的性质和用途，试在以下的空格中选填一种对应气体的化学式（若写气体名称不给分）． （1）具有还原性，可用于冶炼金属的化合物是______， （2）可供家庭用的气体化石燃料的主要成分是______， （3）加压降温后形成的固体可用作制冷剂的是______， （4）燃烧产物无污染，未来可作高能燃料的是______， （5）人类维持生命活动不可缺少的气体是______．
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参考答案：
举一反三
【单选题】Select the correctly punctuated sentence.
A.
After stealing Tims car, the thief lost his way and ended up the chief constable's garage.
B.
After stealing Tim's car the thief lost his way and ended up the chief constable's garage.
C.
After stealing Tim's car, the thief lost his way and ended up the chief constable's garage.
D.
After stealing Tim's car, the thief lost his' way and ended up the chief constable's garage.
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
Tims gran, a formidable woman, always bought him chocolate, cakes, sweets and a nice fresh apple.
B.
Tim's gran a formidable woman always bought him chocolate, cakes, sweets and a nice fresh apple.
C.
Tim's gran, a formidable woman, always bought him chocolate cakes sweets and a nice fresh apple.
D.
Tim's gran, a formidable woman, always bought him chocolate, cakes, sweets and a nice fresh apple.
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
Paul's neighbours were terrible; so his brother's friends went round to have a word.
B.
Paul's neighbours were terrible: so his brother's friends went round to have a word.
C.
Paul's neighbours were terrible, so his brother's friends went round to have a word.
D.
Paul's neighbours were terrible so his brother's friends went round to have a word.
查看完整题目与答案
【单选题】利用渐变工具进行填充的时候,渐变方式一共有( )种。
A.
3
B.
4
C.
5
D.
6
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
a) Spain is a beautiful country; the beache's are warm, sandy and spotlessly clean.
B.
b) Spain is a beautiful country: the beaches are warm, sandy and spotlessly clean.
C.
c) Spain is a beautiful country, the beaches are warm, sandy and spotlessly clean.
D.
d) Spain is a beautiful country; the beaches are warm, sandy and spotlessly clean.
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
Spain is a beautiful country; the beache's are warm, sandy and spotlessly clean.
B.
Spain is a beautiful country: the beaches are warm, sandy and spotlessly clean.
C.
Spain is a beautiful country, the beaches are warm, sandy and spotlessly clean.
D.
Spain is a beautiful country; the beaches are warm, sandy and spotlessly clean.
查看完整题目与答案
【单选题】利用渐变工具进行填充的时候,渐变方式一共有( )种。
A.
5
B.
4
C.
6
D.
7
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
a)After stealing Tims car, the thief lost his way and ended up the chief constable's garage.
B.
b)After stealing Tim's car the thief lost his way and ended up the chief constable's garage.
C.
c)After stealing Tim's car, the thief lost his way and ended up the chief constable's garage.
D.
d)After stealing Tim's car, the thief lost his' way and ended up the chief constable's garage.
查看完整题目与答案
【单选题】利用渐变工具进行填充的时候，渐变方式一共有多少种？
A.
4
B.
5
C.
6
D.
7
查看完整题目与答案
【单选题】反应A(g)+3B(g)↔2C(g); 是一个放热的反应,达到平衡后,将气体混合物的温度降低,下列叙述中正确的是
A.
正反应速率加大，逆反应速率减小，平衡向正反应方向移动
B.
正反应速率变小，逆反应速率增大，平衡向逆反应方向移动
C.
正反应速率和逆反应速率减小，平衡向正反应方向移动
D.
正反应速率和逆反应速率减小，平衡向逆反应方向移动
E.
正反应速率和逆反应速率不改变，平衡向正反应方向移动
查看完整题目与答案
相关题目：
【单选题】Select the correctly punctuated sentence.
A.
After stealing Tims car, the thief lost his way and ended up the chief constable's garage.
B.
After stealing Tim's car the thief lost his way and ended up the chief constable's garage.
C.
After stealing Tim's car, the thief lost his way and ended up the chief constable's garage.
D.
After stealing Tim's car, the thief lost his' way and ended up the chief constable's garage.
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
Tims gran, a formidable woman, always bought him chocolate, cakes, sweets and a nice fresh apple.
B.
Tim's gran a formidable woman always bought him chocolate, cakes, sweets and a nice fresh apple.
C.
Tim's gran, a formidable woman, always bought him chocolate cakes sweets and a nice fresh apple.
D.
Tim's gran, a formidable woman, always bought him chocolate, cakes, sweets and a nice fresh apple.
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
Paul's neighbours were terrible; so his brother's friends went round to have a word.
B.
Paul's neighbours were terrible: so his brother's friends went round to have a word.
C.
Paul's neighbours were terrible, so his brother's friends went round to have a word.
D.
Paul's neighbours were terrible so his brother's friends went round to have a word.
查看完整题目与答案
【单选题】利用渐变工具进行填充的时候,渐变方式一共有( )种。
A.
3
B.
4
C.
5
D.
6
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
a) Spain is a beautiful country; the beache's are warm, sandy and spotlessly clean.
B.
b) Spain is a beautiful country: the beaches are warm, sandy and spotlessly clean.
C.
c) Spain is a beautiful country, the beaches are warm, sandy and spotlessly clean.
D.
d) Spain is a beautiful country; the beaches are warm, sandy and spotlessly clean.
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
Spain is a beautiful country; the beache's are warm, sandy and spotlessly clean.
B.
Spain is a beautiful country: the beaches are warm, sandy and spotlessly clean.
C.
Spain is a beautiful country, the beaches are warm, sandy and spotlessly clean.
D.
Spain is a beautiful country; the beaches are warm, sandy and spotlessly clean.
查看完整题目与答案
【单选题】利用渐变工具进行填充的时候,渐变方式一共有( )种。
A.
5
B.
4
C.
6
D.
7
查看完整题目与答案
【单选题】Select the correctly punctuated sentence.
A.
a)After stealing Tims car, the thief lost his way and ended up the chief constable's garage.
B.
b)After stealing Tim's car the thief lost his way and ended up the chief constable's garage.
C.
c)After stealing Tim's car, the thief lost his way and ended up the chief constable's garage.
D.
d)After stealing Tim's car, the thief lost his' way and ended up the chief constable's garage.
查看完整题目与答案
【单选题】利用渐变工具进行填充的时候，渐变方式一共有多少种？
A.
4
B.
5
C.
6
D.
7
查看完整题目与答案
【单选题】反应A(g)+3B(g)↔2C(g); 是一个放热的反应,达到平衡后,将气体混合物的温度降低,下列叙述中正确的是
A.
正反应速率加大，逆反应速率减小，平衡向正反应方向移动
B.
正反应速率变小，逆反应速率增大，平衡向逆反应方向移动
C.
正反应速率和逆反应速率减小，平衡向正反应方向移动
D.
正反应速率和逆反应速率减小，平衡向逆反应方向移动
E.
正反应速率和逆反应速率不改变，平衡向正反应方向移动
查看完整题目与答案
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