单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
（） 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
