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GB 9787-1988熱軋等邊角鋼尺寸、外形、重量及允許偏差 |
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Archiver|手機版|小黑屋|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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發(fā)表于 2007-11-16 08:50:37
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