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為什么都鑲了黑色點(diǎn)點(diǎn)的圓鐵塊? |
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點(diǎn)評(píng)
非常感謝,!
評(píng)分
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點(diǎn)評(píng)
說(shuō)明你觀察不錯(cuò)啊
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點(diǎn)評(píng)
隨便啦,,這個(gè)不是重點(diǎn),。主要是重載低速用的,高速了發(fā)熱會(huì)很大,,但在承重上,,比滾動(dòng)的好,也方便,。
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