單項(xiàng)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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)選擇題The young motorman as well as the others （）to operate the oil separator.

A.has learnt
B.have learnt
C.learn
D.are learning

4.單項(xiàng)選擇題No sooner （） than they started to repair the sludge pump.

A.the second engineer had got into the engine room
B.the second engineer got into the engine room
C.has the second engineer got into the engine room
D.did the second engineer get into the engine room

5.單項(xiàng)選擇題（）the moveable plate and floating ring inside the pump is very difficult.

A.Having adjusted
B.Being adjusted
C.To adjust
D.Adjusted