Terms for subject Telecommunications containing spare

English	Chinese
casualty spare	事故备用设备
depot spare part	库存备件
mounted spare	安装备用件
spare capacity	备份容量
spare channel	备用信道
spare code	空号
spare code	备用代码
spare level	交换机备用层
spare number	空号
spare pair	备用线对
spare stock	备用组件