In a four-stroke engines the camshaft rotates at （）.<br>A:half the engine rotational speed<br>B:twice the engine rotational speed<br>C:the engine rotational speed<br>D:four times the engine rotational speed

In a four-stroke engines the camshaft rotates at （）.
A:half the engine rotational speed
B:twice the engine rotational speed
C:the engine rotational speed
D:four times the engine rotational speed

出自：海船船员证

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