One of the differences between a two-stroke engine and a four-stroke engine is,（）<br>A:a two-stroke engine works without exhaust operation<br>B:a two-stroke engine works without compression stroke<br>C:a two-stroke engine works without expansion stroke<br>D:a two-stroke engine works without suction operation

One of the differences between a two-stroke engine and a four-stroke engine is,（）
A:a two-stroke engine works without exhaust operation
B:a two-stroke engine works without compression stroke
C:a two-stroke engine works without expansion stroke
D:a two-stroke engine works without suction operation

出自：海船船员证

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