2674| 14
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一個(gè)鏈輪工程圖 |
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點(diǎn)評(píng)
相貫線在國(guó)標(biāo)中本來(lái)就有簡(jiǎn)化畫(huà)法,,
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點(diǎn)評(píng)
退刀槽,避讓鏈條,,另外槽帶公差,,似乎有其它作用
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