单项选择题
Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?（）
A.Hydrazine treatment of condensate B.Frequent compounding C.Chemical cleaning D.Bottom blowing
单项选择题 Failure of the burner flame in an auxiliary boiler would probably be a result of（）
单项选择题 Which action should be taken when an auxiliary boiler in is operation?（）
单项选择题 Ignition failure in an automatically controlled auxiliary boiler could be caused by（）
