电源频率
power frequency
mains frequency
line frequency
power supply frequency
Frequency
frequency of electric source
轻便泡沫喷雾器
portable foam applicator unit
轻便单向闸瓦间隙自动调整器
light-single-acting automatic slack adjuster
轻便式刻度器
portable environmental calibrator
轻便式织品汽蒸器
portable steamer for fabric