Air scavenging of a diesel engine cylinder（）<br>A:blows out the exhaust gases<br>B:supplies oxygen for combustion<br>C:cools the valves and cylinder walls<br>D:all of the above

Air scavenging of a diesel engine cylinder（）
A:blows out the exhaust gases
B:supplies oxygen for combustion
C:cools the valves and cylinder walls
D:all of the above

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