单选题Which of the following statements concerning fire-tube boilers is correct?()ACombustion gases flow through the tubesBFlames impinge on the tubesCCombustion occurs in the tubesDWater flows through the tubes

单选题
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


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