Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）<br>A:Natural convection only<br>B:Forced convection only<br>C:Both natural convection and forced convection<br>D:None

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

出自：海船船员证

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