單項選擇題

The piston cooling system may employ similar components, except that （） is used instead of a head tank.

A.a sump tank
B.a feed well
C.a double bottom tank
D.a drain tank

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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

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

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