铁路固定装置。电气牵引电缆用嵌入钢筋混凝内的密排导管。直管构件。

Fixed railway installations. compact ducting in reinforced concrete for electric traction cables. straight units.

youdao

铁路固定装置。电气牵引电缆用嵌入钢筋混凝内的密排导管。直管构件。

Fixed railway installations. compact ducting in reinforced concrete for electric traction cables. straight units.

youdao