protein maintenance requirement
semiannual maintenance requirement
maintenance requirement card
amino acid requirement for maintenance
Maintenance energy requirement
previous maintenance interval requirement
protein requirement for maintenance
requirement-oriented maintenance
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