Optimum Maintenance Period
optimum maintenance scheduling
optimum-interval interpolation
maintenance interval
维修周期
保养周期
修理周期
维修间隔
维修间隔期
磨损规律
maintenance interval chart
maintenance interval schedule
optimal maintenance interval period
optimization of maintenance interval
previous maintenance interval requirement
recommended maintenance interval
regular maintenance interval
scheduled maintenance interval
service hour maintenance interval
specified maintenance interval
Fishing boat optimum main engine optimum auxiliari
to approach the optimum from non-optimum
engineering district；maintenance of way section；track division；track district；track maintenance division