单项选择题
A.a burned out solenoid in the oil supply valve
B.high temperature excess air
C.incorrectly setting the hot-well dump valve
D.an incorrectly positioned burner snubber realy
单项选择题 Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）
单项选择题 When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?（）
单项选择题 The amount of chloride content in the water of an auxiliary boiler can be reduced by（）