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單項選擇題

The pistons are cooled by oil supplied from the forced （） system.

A.fresh water
B.sea water
C.lubrication
D.fuel oil

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單項選擇題

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

單項選擇題

The period of valve overlap is when （）.

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are close
D.both valves are open

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