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 Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）
单项选择题 Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）
单项选择题 The procedures recommended for auxiliary boilers having high salinity include （）.