地下管道阴极保护
Cathodic protection of underground pipeline
保护下放
protection down
protection devices arranged near switchgear
超距离下保护层
low protected seam with ultra distance
下保护层
lower protective seam
under-protecting coal stratum
下保护层开采
lower protective seam mining
远程下保护层
Long-range Protective Layer
远距离下保护层开采
far distance lower protective seam exploitation
95%Al2O3超长热电偶保护管
Elongated thermocouple protecting tube made of 95% Al2O3
版权保护管理系统
copyright protection management system
保护管理
Protection and management
Protective management
Conservation and management
protection administration
Protection
the management of protection
保护管理对策
countermeasure for the protection and management
保护管理机
protection manage computer
保护管理体系
protection management system
材料保护保养
material protection and maintain