organic heat transfer material heater
downhole electric heater
electric heat accumulator
electric heater
电
电加热炉
电加热
电加热器
电加热元件
电暖器
电热锅炉
电热器
通电加热
电炉
electric heater frost protection
Electric heater seedbed
in duct electric heater
new down hole electric heater
on-site welding repair girth local electric heat treatment
Assistant material organic salt
exotic organic material
indigested gross of organic material
mineralization of organic material