（2009）一平面简谐波在弹性媒质中传播，在某一瞬间，某质元正处

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问题单项选择题

（2009）一平面简谐波在弹性媒质中传播，在某一瞬间，某质元正处于其平衡位置，此时它的：（）

A.动能为零，势能最大

B.动能为零，热能为零

C.动能最大，势能最大

D.动能最大，势能为零

答案

参考答案：C

填空题

用所给单词的适当形式填空。

1. Michael, Darren and Kangkang felt _______ (happy) to see each other in the end.

2. Rainy days make me (feel) sad.

3. It is necessary _______ (finish) the homework on time after class.

4. If you break the traffic rules, you _______ (get) a fine.

5. Maria is as (help) as Jane.

6. The best way (go) there is by train.

7. Helen wants to invite Beth _______ (go) to the movies together.

8. How about (explore) the Ming tombs?

9. Bicycles need _______ (little) space than cars.

10. I am afraid of _______ (ride) my bike at night.

单项选择题

用友报表系统中，不属于账务取数函数的是( )。

A．QC( )

B．PTOTAL( )

C．FS( )

D．LFS( )