executive schedule maintenance
lubrication and preventive maintenance schedule
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 schedule adjustment
optimal maintenance interval period
optimization of maintenance interval
optimization of maintenance schedule
optimum maintenance interval
preventive maintenance schedule
previous maintenance interval requirement
recommended maintenance interval
recommended maintenance schedule
regular maintenance interval
scheduled maintenance interval
semiannual maintenance schedule
service hour maintenance interval
specified maintenance interval