超前或滞后 meaning in Chinese

leading or lagging

Note1 : up screen display power factor and down screen display voltage to be lead or lag
注1 ：上屏显示功率因数，下屏显示电压超前或滞后。
The laboratory can provide calibration for 50 or 60 hz single - phase power factor meters with measuring range from zero to unity , leading or lagging
功率因数表本所可为频率为50或60hz而测量量程由零至一超前或滞后的单相功率因数表提供校正服务。
The laboratory offers calibration for single - phase wattmeters at fixed frequencies of 50 hz , 60 hz or 400 hz , and in the power factor range of unity to 0 . 5 leading or lagging
功率表本所为固定频率50hz ， 60hz或400hz及功率因数为1至0 . 5超前或滞后的单相功率表提供校正服务。