combination of rate meaning in Chinese

分段相加运价
运价组合

For multi - range wattmeters , additional measurements will be made for all combinations of rated voltage and current ranges
若属多量程功率表，则对所有额定电压及电流量程组合进行额外测量。
Additional measurement for each combination of rated voltage and current ranges for multi - range wattmeters ( same frequency and power factor as in 1
对多量程功率表(频率及功率因数与1 .相同)的每一额定电压及电流量程组合进行额外测量。