电子管功率定向继电器
electronic valve type power directional relay
冷阴极电子继电器
cold cathode electronic relay
变压器浮子继电器
float relay for transformer
单分子电子器件
unimolecualr electric device
unimolecularelectronic devices
电力电子电器
power electronic equipment
电子电器
electron and electrical equipments
electronic appliance and electrical equipment
electronic and electric appliance
Electronics and Electrical Appliance
Electrical and electronic products
electronic appliances
电子电器产品
Electrical and electronic products
electron and electrical appliance
electrotechnical product
electronic devices
Electronic and Electrical Products
电子电器废弃物
waste electrical and electronic equipment