indirectly heated cathod造句
Tubetetrode(directly/indirectlyheatedcathode).Tubepentodewithdirectlyorindirectlyheatedcathode.Dragontothepagetoaddatubetetrodewithdirectlyorindirectlyheatedcathode....
Tubetetrode(directly/indirectlyheatedcathode).Tubepentodewithdirectlyorindirectlyheatedcathode.Dragontothepagetoaddatubetetrodewithdirectlyorindirectlyheatedcathode....