Valve overlap is the period during which （）.<br>A:the inlet valve is open<br>B:the exhaust valve is open<br>C:both valves are closed<br>D:both valves are open

Valve overlap is the period during which （）.
A:the inlet valve is open
B:the exhaust valve is open
C:both valves are closed
D:both valves are open

出自：海船船员证

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