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为美国大学对学生的要求非常高,所以大量的,截止日期很近的作业是每个中国的留学生常见的毛病。美国的和国内的大学教育系统完全不一样,这样中国留学生要花很长时间习惯于美国大学的作业。去玩、打游戏、做任何他们喜欢做的东西也没时间。可不得了! (a) Assuming your niece picks the places uniformly at random, what is the chance that she locations the (i+1)st rook this kind of that it doesn’t threaten... https://bookmarkangaroo.com/story12972048/%E4%BB%A3%E5%86%99%E8%AE%BA%E6%96%87-can-be-fun-for-anyone

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