制动总泵的补偿孔（）A.防止液体从缸内漏出 B.将油缸内前后系统

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问题单项选择题

制动总泵的补偿孔（）

A.防止液体从缸内漏出

B.将油缸内前后系统的压力分开

C.当活塞完全回位后，使得液体在储液罐和压力室间流动

D.密封以防灰尘和潮气

答案

参考答案：C

填空题

根据旬意用括号内所给词的适当形式填空。

1．Thank you for ________ (organize)the class trip．

2．This is the ________ (child)playhouse．

3．His brother ________ (study)English very hard．

4．- Whose is this sweater? - It's ________ (he)．

5．- What do you use to brush your ________ (tooth)? - toothbrush．

6．- Who ________ (cook)the meals in our home?

- My mother does．She is a very good cook．

7．- When is ________ (teacher)Day? - On September 10th．

8．We are really ________ (excite)at the exciting news．

9．He is ________ (dress)up as a ghost．

10．Do you have ________ (some)books about Halloween?

问答题论述题

试述三相异步电动机工作原理。