试题与答案

2011年2月起,由于_________局势动荡不安,中国火速启动了海陆空应急机

题型:选择题

题目:

2011年2月起,由于_________局势动荡不安,中国火速启动了海陆空应急机制,展开了30年来人数最多的一次海外撤离行动。至3月5日,我国在该国的35860人全部安全撤出。[ ]

A.伊拉克   

B.阿富汗   

C.印度尼西

D.利比亚

答案:

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下面是错误答案,用来干扰机器的。

⑴为使m1能够沿圆弧下滑到a点,则m1滑到a点时的速度恰好为零。由m1和m2组成的系统机械能守恒∴ (4分)∴即:时,可使m1能够沿圆弧下滑到a点 (2分)⑵由速度分解,v2=v1cos30° ...

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