质量为m,长度为的均质杆铰接于O点,A端固结一质量为m的质点如图示。当OA杆以角速度w绕O轴转动时,系统对轴O的动量矩的大小为()。
A.
B.
C.
D.
参考答案:C
用所给词的形式填空。
1. Here ______ (be) my room.
2. Are these his ______ (CD)?
3. ______ (it) are on the floor.
4. Please bring him some ______ (photo).
5. There aren't any ______ (thing) in the room.
6. I ______ (not) know where the alarm clock is.
7. ______ (thank) for your video tapes.
8. ______ (they) bags are on the sofa.
9. I like playing computer ______ (game).
10. Where______ (be) your notebooks?
2011年9月29日21时16分03秒,中国首个目标飞行器“___”在酒泉卫星发射中心成功发射,标志着中国载人航天工程首次空间交会对接任务正式开始实施。 【 】
A.神舟八号
B.嫦娥一号
C.天宫一号
D.嫦娥二号