In four strokes engine, the cycle of events is completed in four strokes of （）.<br>A:the cylinder<br>B:the crankshaft<br>C:the piston<br>D:the cross-head

In four strokes engine, the cycle of events is completed in four strokes of （）.
A:the cylinder
B:the crankshaft
C:the piston
D:the cross-head

出自：海船船员证

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