Materials for the subsequent sealing of joints in underground gas mains - Part 1: Plastic foil and textile fibre linings used to seal gaspipes already in place; safety requirements and testing
地下煤气总管接头的后续密封材料.第1部分:密封已就位煤气管的塑料箔和纺织纤维衬里；安全要求和测试

1998-01-01