单线双线铁路
single and double line railway
单线双向运行
Bidirectional Operation on Single Track
电力负荷无线双向管理系统
electric load wireless two-way management system
兰新第二双线
The second double-line of Lanzhou-Urumchi railway
双纤双向线性倒换环
two-fiber bidirectional linear switched ring
双线双铺施工机具
Equipment for laying tracks parallelly
双线线路切换环
BLSR Bi-directional Line – Switched Ring
BLSR Bi-directional Line C Switched Ring
双向二端可控硅
bi-directional diode thyristor
bi- directional diode thyristor
双向二端闸流管
bidirectional diode-thyristor