4936| 10
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美國(guó)齒輪圖紙求教 |
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點(diǎn)評(píng)
這2個(gè)值再齒輪的加工制造中很重要嗎?為什么記得機(jī)械原理課中沒(méi)有提到過(guò)。,。,。
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點(diǎn)評(píng)
what??
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點(diǎn)評(píng)
學(xué)習(xí)了,!
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