单项选择题
Diesel engine waste heat boiler construction is usually of the fire-tube or（）
A.cyclone furnace boiler type B.dry back boiler type C.water-tube type D.critical circulation boiler type
单项选择题 Auxiliary boilers are divided into several classifications, one of which is（）
单项选择题 Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）
单项选择题 Auxiliary boilers can be classified as（）
