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單項(xiàng)選擇題

Auxiliary boilers are divided into several classifications, one of which is（）

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

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單項(xiàng)選擇題

Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）

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

單項(xiàng)選擇題

Auxiliary boilers can be classified as（）

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