地下管网 underground pipe networks ; network of underground ; Underground pipe

地下管网改造工程 the projects of upgrading underground pipe networks

地下管道 under ground piping ; underground pipeline ; [建] underground conduit ; sunken pipe

地下管道阀 Culvert valves ; Culert ales ; Culvert t valves

地下管线测量 [建] underground pipeline survey

地下管路 Underground conduit

地面和地下管线过渡段 abovebelow ground transition

保温地下管 insulated underground piping

地下管线探测仪 underground pipeline finder