08/30168693 DC : DRAFT JULY 2008被替代
BS EN ISO 1452-4 - PLASTICS PIPING SYSTEMS FOR WATER SUPPLY AND FOR BURIED AND ABOVE-GROUND DRAINAGE AND SEWERAGE UNDER PRESSURE - UNPLASTICIZED POLY(VINYL CHLORIDE) (PVC U) - PART 4: VALVES
出版：British Standards Institution
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