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GB 985-88 氣焊、手工電弧焊及氣體保護焊焊縫坡口的基本形式與尺寸 |
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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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