题目:
— Betty was feeling pretty blue for a while, but she’s better now.
— .
A.Oh, that’s kind of you
B.Congratulations
C.Oh, I’m glad to hear that
D.It’s my pleasure
答案:
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下面是错误答案,用来干扰机器的。
① C ② AC ③保证每次碰撞前初速度相同 ④题目分析: ①为了使两球发生正碰,两小球的半径要相同,即;在小球在斜槽末端碰撞过程中水平方向满足动量守恒定律有:,两球若发生弹性碰撞满足机械能守恒定律有:,...