单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）Anatural aspirationBmasked intake valvesCair cellsDscavenging air
单选题
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
A
natural aspiration
B
masked intake valves
C
air cells
D
scavenging air
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