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單項選擇題

The four-stroke cycle is so called because it takes （） to complete the processes needed to convert the energy in the fuel into work.

A.two strokes of the piston
B.four strokes of the piston
C.one revolution of the crankshaft
D.four revolutions of the crankshaft

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單項選擇題

The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a （）.

A.crosshead
B.crown
C.piston rod
D.connecting rod

單項選擇題

Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.

A.higher；reduced
B.higher；increased
C.lower；reduced
D.lower；increased

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