5576| 18
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有沒(méi)有人提出過(guò)一種無(wú)摩擦軸承的概念? |
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評(píng)分
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點(diǎn)評(píng)
記錯(cuò)啦,是第四卷
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點(diǎn)評(píng)
是的,現(xiàn)在主要用在陀螺上。
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