main frequency meaning in Chinese

低周波
主频率
主要频率

Mains frequency coreless , induction furnace for melting copper
工频无心感应熔铜炉
Mains frequency coreless , induction furnace for melting aluminium
工频无心感应熔铝炉
Mains frequency coreless , induction iron - melting furnace and iron - holding furnace
工频无心感应熔铁
Main frequency coreless inductio furnace
无芯工频感应电炉
Experimental research on influence of main frequency of vibration on measurement of vibration rate of particle
振动主频对质点振速测量影响的试验研究

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