Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.
A、dispersant；detergent
B、detergent；dispersant
C、dispersant；dispersant
D、detergent；detergent
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Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.
A、dispersant；detergent
B、detergent；dispersant
C、dispersant；dispersant
D、detergent；detergent
Most marine biological sewage treatment plants consist of all the following statements except （）.
A、aeration tanks
B、settling tanks
C、disinfection agent
D、anaerobic bacteria
Moisture in a D-Cmotor would cause （）.
A、short circuit
B、speed up
C、slow down
D、hunting
Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）
A、increase blow-by in all cylinders
B、incomplete combustion in all cylinder
C、overloading in all cylinders
D、insufficient fuel delivery to all cylinders
Modern centrifuge designs enable continuous over a considerable period of timeThis is achieved by which is timed to discharge the sludge at regular intervals（）
A、an injection process
B、an ejection process
C、a separation process
D、a heating process
Which of the routine maintenance procedures listed is required for starting air receivers?（）
A、over-speeding
B、overload
C、low exhaust temperature
D、high crankcase pressure
