minimum monthly maintenance charge
monthly maintenance scheduling
operation and maintenance charge
half-monthly semimonthly twice monthly
engineering district；maintenance of way section；track division；track district；track maintenance division
additional charge or accessory charge
constant-voltage charge (constant-potential charge)
Ratio of potentio-charge capacity to galvano-charge capacity
terminal receiving system handling charge {= TRS handling charge}
abnormal monthly temperature
absolute monthly maximum temperature
absolute monthly minimum temperature
average monthly consumption
average monthly or period usage