A.the bad smoke
B.the smoky exhaust
C.the exhaust temperature
D.the peak pressure
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A.because
B.though
C.since
D.until
A.polished
B.renewed
C.adjusted
D.ground
A.MIP
B.MCR
C.MEP
D.BHP
A.stop
B.start
C.speed up
D.slow down
A.decreased；opened
B.decreased；shut
C.increased；opened
D.increased；shut
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