单项选择题

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

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单项选择题

A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame

单项选择题

A.condensate
B.a small amount of make-up feed
C.A and B
D.None of the above

单项选择题

A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame