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弱弱的問一句,圖紙右下角的粗糙度和那個負0.3,負0.5的標注各是什么意思 |
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小黑屋|手機版|Archiver|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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