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如图是工人经常使用的铁锹如果把铁锹当作费力杠杆则支点是 点动力作用点是 点阻力作用点是 点．——青夏教育精英家教�—— Template






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sketch 25 Suzzy the stegosaurus
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sketch 2483 Una Catrina by sketchmaster
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tomski如图是工人经常使用的铁锹如果把铁锹当作费力杠杆则支点是 点动力作用点是 点阻力作用点是 coloring
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