短语词组短语bus -bars 母线排transfer bus -bars 切换母线ring bus -bars 环形母线bus s bars 母线enclosed bus -bars 闭锁母线substation bus bars 变电所母线Cell bus bars 电解母线middle voltage bus bars 中压母线bus bars and connections 母线和连接;汇流排和连接 返回 bus bars