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加速下�时地面对斜面的�擦力�右，那么斜面对地面的�擦力�左，但教辅写的�右，是教辅写错了吗 知乎 Template






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tomski加速下�时地面对斜面的�擦力�右，那么斜面对地面的�擦力�左，但教辅写的�右，是教辅写错了吗 知乎 coloring
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