5267| 23
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用在工業(yè)上的"雪橇車"到底是個(gè)什么鬼,? |
評(píng)分
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點(diǎn)評(píng)
就是說(shuō)下面的軸承圈換成鋼板,,再在它的下面按上四個(gè)輪子
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