A.a crankcase explosion
B.a scavenge fire
C.abnormal compression ratio
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A.begin
B.support
C.last
D.extinguish
A.open；“stop”
B.closed；“stop”
C.open；“start”
D.closed；“start”
A.pressure
B.temperature
C.viscosity
D.density
A.slow
B.quick
C.arranged
D.high
A.not good
B.good
C.better
D.the best
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