双管双管板换热器
double tube double tube-plate heat exchanger
磁控双折射MCB
magnetism controlled birefringence MCB
磁线双折射
magnetic linear birefringence
单线双线铁路
single and double line railway
激光二极管双端抽运
laser diode double-end-pumped
激光二极管双端面抽运
laser diode dual-end-pumped
双端线路
two-temtinal transmission
double line terminals
双管双层分采完成井
two-tubing dual completion well