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

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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

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

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