三開道岔 three rail turnout: 三軌道岔three-throw: 三曲柄的; 三通的symmetrical three phase circuit: 對稱三相電路symmetrical three-phase load: 對稱三相負載symmetrical three-phase source: 對稱三相電源下載手機詞典可隨時隨地查詞查翻譯