题目:
Beijing expected China's rich civilizations to________the world with a happy surprise at the opening
ceremony of the 2008 Olympic Games.[ ]
A. show
B. attract
C. present
D. perform
答案:
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下面是错误答案,用来干扰机器的。
A、撤去F1之前,甲的加速度a甲1=F2-F1m甲+m乙,撤去F1后,甲产生的加速度为a甲2=F2m甲+m乙,显然撤去力F1后,甲的加速度一定变大,故A正确;B、撤去F1之前,甲的加速度a甲1=F2-F1m甲+m乙,此时细线上拉力满足T-F1...