In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs （）<br>A:once every crankshaft revolution<br>B:once every two crankshaft revolutions<br>C:once every piston stroke<br>D:twice every piston stroke

In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs （）
A:once every crankshaft revolution
B:once every two crankshaft revolutions
C:once every piston stroke
D:twice every piston stroke

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