单项选择题
A.yellowish flame B.golden yellow flame C.white flame D.brilliant white flame
The feed water to the boiler will comprise （）.A.condens...
单项选择题The feed water to the boiler will comprise （）.
A.condensate B.a small amount of make-up feed C.A and B D.None of the above
Proper combustion in a boiler would be indicated by （）....
单项选择题Proper combustion in a boiler would be indicated by （）.
Black smoke coming from a boiler can be caused by （）.A....
单项选择题Black smoke coming from a boiler can be caused by （）.
A.low water level B.low oil pressure C.excessively high fuel pressure D.an improper air/fuel ratio
