题目:
I can not go to the private high school.______,5000 dollars is just too much for my family to spare from living fees.
A.In other words
B.That is
C.I mean
D.Or rather
答案:
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小球l与小球2第一次在C点碰后速度方向相同,则有在碰时动量守恒:碰后对m1分析做匀速圆周运动碰后对m2分析做匀速圆周运动小球2运动到A点时分析由牛顿第二定律有:代入数据解得:同理当两个小球碰后方向相反碰时动...