
EN 1092-1 DRAFT STANDARD FOR FLANGES AND THEIR JOINTS - CIRCULAR FLANGES FOR PIPES , VALVES AND FITTINGS - PART 1: STEEL FLANGES - PN DESIGNATED
出版:British Standards Institution

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EN 1092-1 DRAFT STANDARD FOR FLANGES AND THEIR JOINTS - CIRCULAR FLANGES FOR PIPES , VALVES AND FITTINGS - PART 1: STEEL FLANGES - PN DESIGNATED
出版:British Standards Institution
专家解读视频