Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）<br>A:natural aspiration<br>B:masked intake valves<br>C:air cells<br>D:scavenging air

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

出自：海船船员证

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