( )是指在齿轮一周范围内，实际公法线长度的最大值与最小值之差。A．公法线长度公差

防治花生蛴螬用什么药？怎样防治？

根据括号中的汉语、首字母或音标写出单词，使句子意思完整正确。(每空限填一词)

1. When I saw the model pyramids and the model Golden Gate Bridge, I couldn't _____ my eyes. (相信)

2. Sandy wants to become a _____ (著名的) singer and travel around the world.

3. American people like calling "film" _____ (电影).

4. There was a lot of _____ (车辆) on the city road. We'd better take the underground.

5. I decided to stay home and pack my bags i_____ (代替).

6. There is _____ (什么也没有) in the fridge. It's empty.

7. It's such an easy book. _____ (甚至) a child can understand it.

8. I was playing computer games the _____ (整个的) afternoon yesterday.

患者水肿日久，反复迁延，腰以下肿甚，按之凹陷不起，尿量减少或反而增多，舌淡胖，苔白，脉沉细或沉迟者，可兼见

A．面色灰滞或白，心悸气促

B．面色萎黄，脘闷纳减便溏

C．烦热口渴，脘腹胀满

D．恶风发热，身痒

E．身重困倦，胸闷纳呆泛恶

工业革命首先是生产工具的革命，而首先进行这种革命的行业是（）

A.丝绸业

B.棉纺织业

C.冶金业

D.交通运输业

计算题：现有一份砂样品，准确称取烘干试样两份，各500g，试样经筛分后结果如下表，试计算砂的细度模数，并判断砂的粗细程度。