短语词组短语Grounding Busbar 接地棒;接地母牌master grounding busbar 主接地母线telecommunication grounding busbar 电子通讯接地棒telecommunication main grounding busbar 电子通讯主要接地棒TMGB Telecommunications Main Grounding Busbar 远程通信主接地汇流排 返回 busbar grounding