Auxiliary boilers can be classified as（）<br>A:water-tube natural circulation boilers<br>B:fire-tube boilers<br>C:water-tube forced circulation boilers<br>D:all of the above

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

出自：海船船员证

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