Foaming in the steam drum may be caused by （） in a boiler.<br>A:oxygen in the water<br>B:poor boiler design<br>C:density too high<br>D:excessive steam demand

Foaming in the steam drum may be caused by （） in a boiler.
A:oxygen in the water
B:poor boiler design
C:density too high
D:excessive steam demand

出自：海船船员证

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