樓主: chx2399
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螺紋收尾,、退刀槽 |
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點(diǎn)評(píng)
就如按照牛頓定律計(jì)算落下的雨滴會(huì)打死人一樣,實(shí)際雨滴沒有打死人,,就說明計(jì)算過程有問題了,。再看一下
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