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最佳答案：阿斯顿法国红酒
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最佳答案：There's no need to remember the words by rote.During the time when you are learn
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最佳答案：You have been to university for five weeks. University life is simple and intere
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最佳答案：University students, a group supposed to be raise with good habits and behaviour
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最佳答案：洛伦兹变换：Vx'=(Vx-u)/(1-u*Vx/c^2),由于不能达到光速,你这问题不对,不妨设A,B均以0.99C向左,右,则代入Vx=0.99C,u=-0