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BS EN 751-1 1997 Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water. Anaerobic jointing compounds.pdf文档页数:13文档大小:726.25KB文档格式:pdf STD.BSI BS EN 751-1-ENGL 1997 16246690623754530 BRITIS