5427| 13
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齒輪減速機(jī),我大學(xué)時(shí)畫的,比較粗糙 |
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點(diǎn)評(píng)
一眼看到錯(cuò)誤,不簡(jiǎn)單,!
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點(diǎn)評(píng)
從我大學(xué)的時(shí)候就是這個(gè)了 唉 教育有待改革啊
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