（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）<br>A:Inefficient scavenging；twice<br>B:Inefficient scavenging；1~8 times<br>C:Fewer strokes in a circle；twice<br>D:Fewer strokes in a circle；1~8 times

（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）
A:Inefficient scavenging；twice
B:Inefficient scavenging；1~8 times
C:Fewer strokes in a circle；twice
D:Fewer strokes in a circle；1~8 times

出自：海船船员证

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