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ClassDS
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Peking4th
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北京四中初中物理
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初三物理
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力和机械(初三)
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1弹力弹簧 测力计
2020-09-22 02:04:42
112.8MB
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2重力
2020-09-22 02:04:47
119MB
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3摩擦力
2020-09-22 02:04:49
140.7MB
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4杠杆
2020-09-22 02:04:55
113.9MB
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5滑轮
2020-09-22 02:05:01
129.3MB
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