单项选择题

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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单项选择题

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

单项选择题

The young motorman as well as the others （）to operate the oil separator.

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

单项选择题

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