The period when both inlet valves and exhaust valves are open is referred to as （）.<br>A:valve loop<br>B:valve uniflow<br>C:valve overlap<br>D:valve grinding

The period when both inlet valves and exhaust valves are open is referred to as （）.
A:valve loop
B:valve uniflow
C:valve overlap
D:valve grinding

出自：海船船员证

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