Track Maintenance
轨道养护
线路维修
线路养护维修
轨道维护
线路养护
轨道维修
养护维修
工务
3 level maintenance tset
active maintenance downtime
active maintenance time
active preventive maintenance time
Adaptive Maintenance
适应性养护
自适应维修
适应维护
自适应速度控制
循序修正最佳化
administration of maintenance equipment
agricultural machinery maintenance
Aircraft maintenance management
Aircraft maintenance worker