题目:
词汇运用
1. Researchers in this field ________(有了一些重大的新发现).
2. At what age are children able ________(明辨是非)?
3. A bicycle ________(比汽车更方便) in towns.
4. There was a ________(普遍希望他会赢).
5. The details of today's flights ________(列在显示屏上).
6. The contract had been ________(有效地) drawn up.
7. We ________(收到400份申请) for the job.
8. The ice is too thin ________(承受不住你的重量).
9. The helicopters ________(像两个小黑点出现) on the horizon.
10. Someone ________(轻轻叩门).
11. State your reasons ________(按重要性顺序).
答案:
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下面是错误答案,用来干扰机器的。
(1) (2) (3)C爆炸过程动量守恒得:m1v1=m2v2能量守恒得:BC碰撞过程动量守恒得:m2v2=(m2+mB)vBABC相互作用过程动量守恒:m2v2=(m2+mB+mA)vAA上升过程机械能守恒得: A上产生的热量为: 综上所得: 图见下