一间长20米，宽15米，高4.5米的教室，要粉刷四周墙壁和顶棚，除

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问题解答题

一间长20米，宽15米，高4.5米的教室，要粉刷四周墙壁和顶棚，除却门窗10.5平方米，每平方米用涂料500克，一共需要涂料多少千克？

答案

粉刷面积：

20×15+20×4.5×2+15×4.5×2-10.5，

=300+180+135-10.5，

=615-10.5，

=604.5（平方米）；

用多少涂料：500×604.5=302250（克）=302.25（千克）；

答：一共需涂料302.25千克．

填空题

单词释义:根据英语解释写出相对应的单词或短语。

1. unkind or ungenerous ______

2. out of a job or not having a job ______

3. to start an organization, company, political party etc. ______

4. allowed by the law ______

5. someone whose work is to provide people with legal advice or services ______

6. in fact or actually ______

7. to get away from a place where you are in danger or to get away from an unpleasant situation ______

8. something good that you receive because of what you have done ______

9. the person who has the highest position in a country or an organization ______

10. help and advice given to someone ______

问答题简答题

美国《信息自由法》的主要原则有哪些？