According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）<br>A:1/2<br>B:1<br>C:2<br>D:3

According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）
A:1/2
B:1
C:2
D:3

出自：海船船员证

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