A、fire-tube controlled circulation
B、fire-tube supercritical circulation
C、water-tube natural circulation
D、water-tube express circulation
更多“Auxiliary boilers are divided into several classifications, one of which is（）”相关的问题
A、water-tube natural circulation boilers B、fire-tube boilers C、water-tube forced circulation boilers D、all of the above
A、caustic embrittlement of the boiler metal B、acidic corrosion of the boiler metal C、hard scale deposits on the boiler tubes D、etching of the heat exchange surfaces
A、boiler water level is low B、feedwater is too hot C、boiler steam demand is low D、feedwater is too cold
A、high steam pressure in the boiler B、abnormally high feed water temperature C、abnormally high boiler water temperature D、steam demand exceeding feed pump capacity
A、one to supply steam to the main propulsion turbine B、an auxiliary boiler C、A and B D、neither A nor B
A、completely drain the boiler in an emergency B、prevent sludge from forming in the drum C、remove floating impurities from the boiler water surface D、remove settled solids from the water drum
A、A.fuel pump failure B、B.fan motor failure C、C.increased feedwater consumption D、D.decreased boiler efficiency
A、adding hydrazine B、blowing down the boiler C、adding phenolphthalein D、adding a sulfite chloride scavenger
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