能正确书写化学方程式是学好化学的基础.写出下列反应的化学方程式: (1)实验室用

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问题:

能正确书写化学方程式是学好化学的基础.写出下列反应的化学方程式:

(1)实验室用高锰酸钾制取氧气:______

(2)燃烧一氧化碳以获得热量:______

(3)木炭高温下还原氧化铜:______.

考点:化学反应方程式的书写文字表达式
题型:填空题

电力行业的国家垄断经营管理在建国50年来,特别是改革开放20年以来,中国经济快速发展时期发挥了重要作用。

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阅读理解。

     As you make a study of music, you'll find it familiar to you. Music can tell you of famous persons,

interesting places and exciting things. It expresses feelings and ideas of the people, which seem your own.

If you are deep in listening, you will feel people at work, at play or in the army, in the field, and you may

find music expressing the love of nature, of hometown, and of our nations.

     Music is also an expression of the composer  (作曲家). As an artist, the composer expresses his own musical ideas. He studies the materials of music and finds ways of using them, and also he searches for

new kinds of musical expression. Music can even suggest activities and feelings we all share. We can

enjoy playing, listening, and dancing. On the whole, the wonderful songs bring us beauty-enjoying and are useful for our mind-training.

1. Music can tell you of                 .

A. famous persons and sad things

B. heroes and interesting places

C. famous persons and exciting things

D. interesting places, exciting things as well as famous persons

2. When you are listening to the music, you may find ________.

A. children are at play

B. soldiers are in the army

C. music is expressing the love of nature, of hometown, and of our nations

D. people are doing something

3. Music is also an expression of                  .

A. the composer        

B. the writer

C. the hero            

D. the singer

4. A composer is a person who _               .

A. writes novels      

B. writes music

C. sings              

D. dances

5. The wonderful songs bring us                  .

A. to enjoy playing and dancing

B. to like the music

C. beauty-enjoying and are useful for our mind-training

D. to build our minds

题型:填空题

科技文献中常出现下列词汇,其中与相关物质的颜色无关联的是[ ]

A.绿色食品

B.白色污染

C.棕色烟气

D.赤潮

题型:填空题

“商品”与“顾客”两个实体集之间的联系一般是( )。

A.一对一

B.一对多

C.多对一

D.多对多

题型:填空题

测量实际制冷系统压缩机吸气口温度的目的是为了帮助决定运行工况图上的过()。

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