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.

单项选择题 （） 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.

单项选择题 The difference between a supercharged engine and an un-supercharged engine is that （）.