单项选择题X 纠错
A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.Neither (1) or (2) are correct
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单项选择题
A.water
B.babbitt
C.iron or steel
D.acids
单项选择题
A.Impurities
B.Lube oil
C.Gasoline
D.Diesel fuel
单项选择题
A.relieve excess fuel oil pressure during the “off” fire cycle
B.admit water to the dry pipe
C.throttle the forced draft fan output for proper combustion
D.reduce excess steam pressure in the boiler
单项选择题
A.60 to75
B.80 to 95
C.100 to 115
D.120 to 135
单项选择题
A.heat conduction into the injected fuel oil
B.heat conduction into the water jacket wall
C.water circulation through passages in the holder
D.fuel oil circulation through passages in the holder
单项选择题
A.slightly acidic condition
B.slightly alkaline condition
C.overtreatment of water
D.neutral condition of water
单项选择题
A.Combustion gases flow through the tubes
B.Flames impinge on the tubes
C.Combustion occurs in the tubes
D.Water flows through the tubes
单项选择题
A.slight acidity
B.slight alkalinity
C.excessive alkalinity
D.excessive acidity
单项选择题
A.cold corrosion of the nozzles
B.fuel viscosity for better atomization
C.carbon accumulation on the nozzles
D.fuel detonation in the cylinders