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六角鋼中心基準(zhǔn)怎么表示? |
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點(diǎn)評(píng)
還是以前的標(biāo)六角鋼的對(duì)稱度。
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Archiver|手機(jī)版|小黑屋|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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