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三頭螺紋 螺距17mm 內(nèi)徑7mm 求加工方法 或加工廠 |
小黑屋|手機(jī)版|Archiver|機(jī)械社區(qū) ( 京ICP備10217105號(hào)-1,京ICP證050210號(hào),浙公網(wǎng)安備33038202004372號(hào) )
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