Most medium and slow speed diesels are

1、Medium speed engines have a （） power t

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.Ahigher；reducedBhigher；increasedClower；reducedDlower；increased

2、In a medium speed diesel engine, a tr

In a medium speed diesel engine, a trunk type piston may be cooled by（）Ⅰ.oil circulation though passages in the piston crownⅡ.heat transfer through piston rings and liner wallAⅠ onlyBⅡ onlyCeither Ⅰ or ⅡDneither Ⅰ or Ⅱ

3、For small and medium sized companies,

For small and medium sized companies, the logistics management is still （）.AdecentralizedBcentralizedCintegratedDconcentrated

4、In a large, slow-speed, main propulsio

In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）ABed plateBColumnCEntablatureDTie rod

5、On a medium-speed main propulsion dies

On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.Aa spindle lubricatorBan oil jetCinternal splashingDdrilled passages in the crankshaft

6、All marine low-speed diesels are of wh

All marine low-speed diesels are of what design?（）AFour-strokeBTwo-strokeCElectronic ignitionDForced exhaust