Too much air in the furnace of an oil-fired boiler would be indicated by （）.

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

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

A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio