短语词组短语ground service bus 地面勤务汇流条GSB Ground Service Bus 地面服务汇流条ground -bus s 接地母线ground d bus 接地线ground bus line network 道路公交线网fault ground bus 故障接地母线insulated ground bus 隔离的接地母线electrical ground bus 电气地面公共汽车 返回 ground bus