Digital Trunk Board 数字中继板
sonet digital trunk board 光数字中继板
cord system trunk board 塞绳式中继台
semiautomatic trunk board 半自动式中继台
TAB Trunk test Adaptation Board 中继线测试适配板
board incoming trunk 交换台入中继线
board trunk controller 交换台中继线控制器
trunk line board 中继台
trunk cover board 箱形盖板
trunk cover board design 箱形盖板设计
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