A.stop
B.start
C.speed up
D.slow down
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A.decreased；opened
B.decreased；shut
C.increased；opened
D.increased；shut
A.stop engine
B.finished with engine
C.dead slow ahead
D.dead slow astern
A.stop
B.start
C.speed up
D.slow down
A.a crankcase explosion
B.a scavenge fire
C.abnormal compression ratio
A.begin
B.support
C.last
D.extinguish
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