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

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单项选择题

A.fire-tube controlled circulation
B.fire-tube supercritical circulation
C.water-tube natural circulation
D.water-tube express circulation

单项选择题

A.Natural convection only
B.Forced convection only
C.Both natural convection and forced convection
D.None

单项选择题

A.water-tube natural circulation boilers
B.fire-tube boilers
C.water-tube forced circulation boilers
D.all of the above