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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1.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

2.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

3.單項(xiàng)選擇題（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.

A.The medium speed 4-stroke trunk piston engine
B.The low speed 2-stroke crosshead engine
C.The medium speed 2-stroke crosshead engine
D.The low speed 4-stroke trunk piston engine

4.單項(xiàng)選擇題The difference between a supercharged engine and an un-supercharged engine is that （）.

A.the later
B.the latter
C.the former
D.the farmer

5.單項(xiàng)選擇題（）, the following possible causes should be investigated.

A.Should the engine stop without apparent reason
B.The engine should stop without apparent reason
C.The engine stops without apparent reason
D.The engine is stopped without apparent reason