BS EN 295-4. Vitrified clay pipe systems for drains and sewers. Part 4. Requirements for adaptors, connectors and flexible couplings
出版:British Standards Institution
专家解读视频
BS EN 295-4. Vitrified clay pipe systems for drains and sewers. Part 4. Requirements for adaptors, connectors and flexible couplings
出版:British Standards Institution
专家解读视频