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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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单选题Engine （） refers to the relative time of position of crank, at which each operation during the cycle is commenced and is completed.A
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单选题What determines the number of events occurring in a cycle of operation in an internal combustion engine?（）A
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