A.inside；associated
B.inside；not associated
C.outside；associated
D.outside；not associated
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A.fuel-air ratio
B.compression ratio
C.fuel rack
D.viscosity index
A.boiler
B.main engine
C.auxiliary engine
D.incinerator
A.flash；fresh air
B.wash；fresh water
C.flush；compressed air
D.rush；diesel oil
A.has learnt
B.have learnt
C.learn
D.are learning
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
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