单选题One of the differences between a two-stroke engine and a four-stroke engine is,（）Aa two-stroke engine works without exhaust operationBa two-stroke engine works without compression strokeCa two-stroke engine works without expansion strokeDa two-stroke engine works without suction operation
单选题
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
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