单选题In describing engine operation, what does the term “cycle” mean?（）AThe sequence of events that produce a power pulseBOne rotation of the engine crankshaftCOne stroke of a pistonDAll of the above
单选题
In describing engine operation, what does the term “cycle” mean?（）
A
The sequence of events that produce a power pulse
B
One rotation of the engine crankshaft
C
One stroke of a piston
D
All of the above
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