短語詞組短語electric c flux 電通量;電銲劑electric displacement flux 電位移通量electric -flux density 電通量密度line of electric flux 電通線tube of electric flux 電通量琯unit electric flux 單位電通量outward electric flux 輸出電通量inward electric flux 流入電通量electric field vector flux 電束 返回 electric flux