switchboardn.配电盘；电话总机switchboard control交换机控制switchboard operator(电话)接线员switchboard position交换机席switchboard framework配电盘框架switchboard principle交换机原理switchboard equipment配电盘设备switchboard attendant配电盘值班人员switchboard instruments配电盘仪表switchboard release mode交换机复原方式switchboard cable slitter交换机电缆切开器