短語詞組短語electric field of transmission line 輸電線路工頻電場directional field of contour line 等高線流曏field leakage coefficient of line 線場magnetic field of transmission line 輸電線路工頻磁場magentrical field of power line 交流電源配置field line of force 場力線equation of electric field line 電場線方程base line field of gravity 重力基線場diffusion of magnetic field line [物]磁力線擴(kuò)散 返回 field of line