DIN 8078-2008 聚丙烯(PP)管 PP-H、PP-B、PP-R、PP-RCT 通用质量要求和
DIN 8078-2008 Polypropylene (PP) pipes – PP-H, PP-B, PP-R, PP-RCT – General quality requirements and testing聚丙烯(PP)管 PP-H、PP-B、PP-R、PP-RCT 通用质量要求和测试
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