單項(xiàng)選擇題It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.

A.the suction stroke
B.the compression stroke
C.the expansion stroke
D.the exhaust stroke


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2.單項(xiàng)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

3.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

4.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

5.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