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單項選擇題

In boilers, besides maintaining the burner atomizers, air diffuser vanes, fuel temperature, forced draft fan, fuel pump and other hardware in good condition, there are some adjustments on the （）that can produce a good flame for the most efficient operation.

A.fuel-air ratio
B.compression ratio
C.fuel rack
D.viscosity index

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單項選擇題

The oil sludge is burnt in the （）on board I’ll show you the ashes.

A.boiler
B.main engine
C.auxiliary engine
D.incinerator

單項選擇題

Before dismantling the pipe, would you （）the oil retained in the hose with （）?

A.flash；fresh air
B.wash；fresh water
C.flush；compressed air
D.rush；diesel oil