单项选择题

As an alternative to the conventional seawater cooling system, is based on principles about cooler locations, （）flow control and preheating, but with a central cooler and one additional set of pumps（）.

A.the central cooling system, different
B.the central cooling system, the same
C.the open cooling system, different
D.the open cooling system, the same

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单项选择题

（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.

A.Bad combustion of the fuel
B.Bad atomization of the fuel
C.Liquid contaminants
D.Solid contaminants

单项选择题

The booster pump, which supplies diesel oil to（） , should have a possibility of being powered by compressed air or by emergency power.

A.the main engines
B.the auxiliary engines
C.the emergency generator engine
D.the auxiliary engines and the main engine(s)

单项选择题

A full-flow 50μm filter is installed ,（） so the injection system components on the main engine are safeguarded.

A.as close to the main engine as possible
B.as close to the main pump as possible
C.just before the fuel valve
D.just before the booster pump