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?（）

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

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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

单项选择题

A.The pistons reciprocate
B.The ‘B’ end cylinder barrel rotates
C.There is no fluid flow
D.Power is transmitted hydraulically

单项选择题

A.20
B.40
C.60
D.80