一般情况下，安装使用液压马达应注意哪些问题？

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问题问答题简答题

答案

参考答案：若液压马达规定有背压时，应予以保证；若液压马达与其他机械联接时，要保证联接轴的同轴度。若液压马达的泄油管要保证畅通。

填空题

用括号内所给动词的适当形式填空。

1. She ________ (write) twenty pop songs which are liked by fans by the end of last year.

2. ________ (quarrel) with others isn't good manners for everyone.

3. —_______ the price ________ (include) coffee and hamburgers? －I'm afraid not.

4. The teacher told us that three quarters of our earth ________(cover) by water.

5. Everyone knows that the disabled mustn't ________ (laugh) at.

6. We should try our best to prevent the air pollution ________ (live) a happy life.

7. With all lights on, the hall ________ (become) as bright as day when we arrived.

8. How soon do you think we ________ (get) to the hotel?

9. Mr. Green told me that his family ________ (go) for a holiday the next week.

10. —Did you see him come in just now? —No, I ________(type) a letter all the time.

问答题简答题

机械应力对骨结构的影响。