Which of the following statements concerning fire-tube boilers is correct?（）<br>A:Combustion gases flow through the tubes<br>B:Flames impinge on the tubes<br>C:Combustion occurs in the tubes<br>D:Water flows through the tubes

Which of the following statements concerning fire-tube boilers is correct?（）
A:Combustion gases flow through the tubes
B:Flames impinge on the tubes
C:Combustion occurs in the tubes
D:Water flows through the tubes

出自：海船船员证

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