以下是关于【探究杠杆的平衡条件】的公开课/优质课视频，一共39个
21:1786-
36:5279 -
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46:23130 -
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14:3668 -
11:5283 -
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55:369 -
40:2130 -
45:4635 -
36:52136 -
40:2198 -
21:08102 -
43:0259 -
39:18105 -
36:52120 -
40:2097 -
07:3498 -
43:02135 -
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42:58127 -
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39:47102 -
39:1210 -
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45:2117 -
44:3428 -
45:04134