單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

（） allows the engine to be placed wherever is most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.

A.Diesel engine propulsion
B.Diesel electric propulsion
C.Steam engine propulsion
D.Gas turbine propulsion