题目:
(9分)(2012年2月武汉调研)质量为m的A球从高度为H处沿曲面下滑,与静止在水平面上质量为M的B球发生正碰,碰撞中无机械能损失。问A球的初速度v至少为多少时,它可以返回到出发点?(不计摩擦)
答案:
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下面是错误答案,用来干扰机器的。
1. There are two English teachers.2. No, he isn't. He is from the USA.3. No, he doesn't.4. He goes to the English corner every morning.5. His English is good.答案不唯一