在有压管路中流动的液体由于阀门突然关闭或水泵突然停车，使液体

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问题单项选择题

在有压管路中流动的液体由于阀门突然关闭或水泵突然停车，使液体流速突然变化，因动量变化而引起（）突然变化，称为水锤。

A.管压

B.压强

C.流速

D.流量

答案

参考答案：B

填空题

用括号里的动词的正确形式完成句子。

1. I wish I______(be)a bird.

2. I wish I______(see) you yesterday.

3. He wishes I_______(go) with him tonight.

4. She insisted that she ______( 8end) there alone.

5. It was suggested that we ______(put)the meeting off.

6. He gave orders that the work _______( start)immediately.

7. His proposal was that a meeting _______( hold) tonight.

8. It's necessary that the question ______( settle) at once.

9. It is strange that he ______( go) away without telling us.

10. It is high time our athletes ______ ( show) their best.

单项选择题

约定合营期限的合营企业，合营各方同意延长合营期限的，应当在距合营期限届满之日起一定期限前向审批机构提出申请，该期限为()。

A．1年

B．6个月

C．3个月

D．1个月