"Scavenging" on a diesel engine means （）.<br>A:injecting fuel oil into a cylinder<br>B:removing exhaust gases from the cylinder<br>C:forcing air into the cylinders under pressure after the exhaust valve has dosed<br>D:a combination of all the above

"Scavenging" on a diesel engine means （）.
A:injecting fuel oil into a cylinder
B:removing exhaust gases from the cylinder
C:forcing air into the cylinders under pressure after the exhaust valve has dosed
D:a combination of all the above

出自：海船船员证

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