【化】 双刀双掷; 双刀双掷开关double-pole double-throw
三极双掷闸刀开关three-pole double-throw knife switch
双掷隔离开关double-throw disconnecting switch
双投开关double-throw switch【电】
三极双投刀开关triple-pole double-throw switch【电】
切换触点double-throw contact【电】
双刀双掷开关double-point double-throw switch
单刀双掷开关single-pole double-throw switch