单项选择题
Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）
A.clean the flame scanner photocell window B.Inspect and clean all solenoid valves C.lift the safety valves by hand D.Inspect for oil or water leaks
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（）
单项选择题 The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）
