单项选择题

Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）

A.sulfite or hydrazine
B.sulfite or hygroscopic sulfite
C.bromide or hydrazine
D.bromide or hygroscopic sulfite

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单项选择题

A.the formation of sulfuric acid
B.a decrease in lube oil viscosity
C.a decrease in cooling water pH
D.a thermostat failure

单项选择题

A.increased fuel consumption
B.increased feed water consumption
C.fuel pump failure
D.combustion control system failure

单项选择题

A.Injection pressures
B.Control air supply pressure
C.Cooling water flow through after-coolers
D.Lube oil temperature