单选题Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）AExhaust and scavengingBScavenging and compressionCIgnition and expansionDExhaust and compression
单选题
Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
A
Exhaust and scavenging
B
Scavenging and compression
C
Ignition and expansion
D
Exhaust and compression
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