A.flash；fresh air
B.wash；fresh water
C.flush；compressed air
D.rush；diesel oil
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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
D.did the second engineer get into the engine room
A.Having adjusted
B.Being adjusted
C.To adjust
D.Adjusted
A.coming up from the BDC
B.coming up from the TDC
C.coming down from the BDC
D.coming down from the TDC
A.open
B.close
C.drain
D.vent
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