river channel maintenance
high-speed buffer register
deep-water channel in the north channel
disease of one channel involving another channel
accept code register and mask code register
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