高密度聚乙烯大口径中空壁缠绕管
high density polyethylene pipes
大口径管材
large diameter pipe
large caliber winding pipe
large caliber pipe
空中大绕环
grand rond de jambe en l’air
ouverture de jambe
grand rond de jambe en l’air
ouverture de jambe
中大口径高合金管材
Large-medium sized hi-alloy steel tubular products
长距离大口径PCCP输水
long-distance and super-large diameter PCCP pipeli
大管径长距离平坦管道
long distance and large diameter flat pipeline
大管径流量测量
large diameter pipe flow measurement
大管径输水管道
big caliber convey water pipes
大口径、长焦距平行光管
large-aperture and long-focus collimator