樓主: 韓寒11
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什么原理加工出來(lái)的六方,? |
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點(diǎn)評(píng)
好久好久以前,,當(dāng)你還是一個(gè)機(jī)械小菜鳥的時(shí)候,。你磨的鉆頭打出的孔是三角形的
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