purging of heat-supply pipeline的意思|示意

供热管道清洗 ... purging N2 吹洗[用]氮气 purging of heat-supply pipeline 供热管道清洗 purification 净化，提纯，精制；纯化；精炼 ...

管道清洗 综合 ... 热网温度试验 hot-state strength test of heat-supply network 管道清洗 purging of heat-supply pipeline 热网试运行 trial operation of heat-supply network ...