three phase three wire system 三相三线制

two phase three wire system 双相三线制 ; 二相三线制 ; 两相三线制

two-phase three-wire system [电] 两相三线制

ac three-phase three-wire system 交流三相三线制

three-phase three wire system 三相三线系统

three-phase three-wire system 三相三线制系统

single-phase three wire system 单相三线制

two phase three-wire system 二相三线制

three phase four wire system 三相四线制