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圖紙螺紋標(biāo)注為2-M20-6Hb40 ,那個b40 是什么意思�,�,? |
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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,,京ICP證050210號,,浙公網(wǎng)安備33038202004372號 )
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