U型垂直埋地换热器
U-vertical underground heat exchanger
U型垂直埋管换热器
vertical U-tube heat exchanger
垂直埋管换热器
vertical geothermal heat exchangers
钢套钢蒸汽直埋管道
direct embedment steel steam pipe with steel jacket
预制直埋管道系统
buried preinsulated pipe system
蒸汽直埋管道
directly buried steam pipe
垂直U形埋管
U-shape vertical loop of pipe
单位面积埋管长度
tube length per unit area
单丝埋弧焊
single wire submerged arc welding
单电源双丝埋弧焊
single power source twin-wire submerged arc weldin
单U、双U型埋管
single U shaped and double U shaped vertical borehole
大型直缝埋弧焊钢管
large diameter longitudinal seam submerged arc welding(LSAW) pipe