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问题 选择题

为了让煤充分燃烧，正确合理的措施是

A．增加煤的用量

B．提高锅炉的耐热性

C．粉碎煤块

D．减少空气通入量

答案

答案：C

题目分析：为了让煤充分燃烧，常见的方法是要有充足的氧气，然后要与氧气充分的接触，可以将煤块粉碎，以增大与氧气的接触面积，也可以增加通入的氧气的量。故选C

填空题

当x→0时，f(x)与sin2x是等价无穷小量，则=______.
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填空题

根据下列句子所给的中英文提示，写出各单词的正确形式。

1. —I don't think Liu hua is _____ (英俊).

    —I really don't agree with you.

2. My daughter has a _____ (圆的) face like an apple.

3. My friend often shares his _____ (欢乐) with me.

4. We often borrow books and _____ (杂志) from our school library.

5. The cat makes him look_____ (特别).

6. He is not tall—_____ (几乎) 1.70 meters.

7. I hate the _____ (广告) when I watch TV.

8. —How long did you spend _____(dealing with something) this problem ?

    —About half an hour.

9. I'll buy a pair of glasses because of my poor _____ (the ability of see).

10. China is _____ (very well-known) for the Great Wall.

11. We all can't forget the _____ (giving one a feeling of happiness) hiking to the town of Datao.
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