Y型取排水口
Y-type water intake-outlet arrangement
暗管排水
underground pipe draining water
underground pipe drains
underground pipe drainage
closed drainage
subsurface drainage
sub drain
暗排水系统
drainage system with underground pipe lines
巴陵石油化工公司供排水一厂
baling petrochemical corp
No
1 Waterworks
Yueyang
坝面排水系统设计
design of dam face drainage system
爆夯动力排水固结法
Dynamic drainage consolidation method by blasting ramming
北京城市排水集团有限责任公司
beijing drainage group co.
Ltd.
北京城市排水集团有限责任公司管网设施管理分公司
Branch of Network Facilities Management
beijing drainage group co.
Ltd.