單項選擇題Water enters the rotating impeller through the entry, known as “（）”, at the centre.
A.eye
B.hole
C.balance holes
D.opening
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1.單項選擇題Which one is not the normal operation for boiler shutdown?（）
A.Carry out soot blowing if permissible
B.Change fuel supply to diesel oil
C.Close steam stop valves on boiler when pressure is reduced
D.Drain boiler empty when it has cooled down
2.單項選擇題The forced draught fan should be started and air passed through the furnace for several minutes to “（）” it of any exhaust gas or oil vapors.
A.blow
B.clean
C.scavenge
D.purge
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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
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題型：單項選擇題