【求助】BS EN253标准

仙豆 2010/06/08

[quote]原文由 [b]gdffjyb001(gdffjyb001)[/b] 发表: [size=6][b]BS EN 253 District heating pipes. Preinsulated bonded pipe systems for directly buried hot water networks. Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene[/b][/size][/quote]