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Most parents, in fact, aren't very helpful with the problems that their sons and daughters have in to their college life.
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You can count how many students passed an exam, but psychological and emotional feelings cannot bemeasured.
In short, participation in spans is extremely for college students not only physically but also emotionally and socially.
无齿曳引机常用于电梯速度v≤2.5 m/s 的电梯上。
相互独立的两个卡方变量与其自由度的商的比值为 F 分布的变量。（）
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