单项选择题
The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.
A.seawater contamination B.frequent surface blows C.dissolved oxygen deaeration D.frequent bottom blows
单项选择题 The water in an auxiliary boiler should be tested for chloride content to determine （）.
单项选择题 Cooling the intake air supplied to a diesel engine will （）.
单项选择题 Excessive vibration of an automatically fired auxiliary boiler can be caused by （）
