單項(xiàng)選擇題

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

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