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初二物理：人和重物在吊篮内，人拉重物时，四种说法正确的是？
初二物理：人和重物在吊篮内，人拉重物时，四种说法正确的是？
郝老师讲初二物理功和机械能47/58
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初二物理：人和重物在吊篮内，人拉重物时，四种说法正确的是？
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