If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.<br>A:open；short；after<br>B:closed；short；after<br>C:open；long；before<br>D:closed；long；before

If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.
A:open；short；after
B:closed；short；after
C:open；long；before
D:closed；long；before

出自：海船船员证

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