engineering district；maintenance of way section；track division；track district；track maintenance division
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
循序修正最佳化
自适应速度控制
适应维护
administration of maintenance equipment
administrative and maintenance message operational
administrative system of preventive maintenance
advanced optimization of distribution maintenance scheduling
advisory letter [slope maintenance]
aeroengine condition monitoring and maintenance da
Aeroengine condition monitoring and maintenance data processing