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绳子一端系在屋顶，另一端绕过托板上的�轮，被小明拉在手里，小明能把自己拉升去吗？ 知乎 Template






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tomski绳子一端系在屋顶，另一端绕过托板上的�轮，被小明拉在手里，小明能把自己拉升去吗？ 知乎 coloring
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