they are more heavily built
the fuel used is less volatile
they can be easily reversed
they operate at a lower speed
第1题：
Power operated cranes used on a ship must not be powered by ______.
A.diesel engine
B.chargeable batteries
C.electric motors
D.gasoline engines
第2题：
All diesel engines are classified as ______．
A.Four cycle
B.Compression ignition
C.Vacuum ignition
D.External combustion
第3题：
Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.
A.The direction of pressure on the journal in four-stroke engine is continuously
B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D.Low-stroke engines usually consume less lube oil than four-stroke engines
第4题：
higher speed required
flywheel-effect
lower starting temperatures
higher compression pressures
第5题：
less even torque
higher cylinder head temperatures
fewer power strokes per revolution
greater weight/size requirements
第6题：
Upon completion of fueling a gasoline driven vessel it is necessary to ______.
A.keep ports，doors，windows，and hatches closed
B.start engines immediately
C.ventilate before starting engine
D.None of the above
第7题：
Vessels required to be equipped with an approved backfire flame arrester are ______．
A.Those with diesel engines
B.All those with gasoline engines
C.Those with large engines only
D.None of the above
第8题：
Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to _____________.
A.higher speed required
B.flywheel-effect
C.lower starting temperatures
D.higher compression pressures
第9题：
chromium plating piston rings
knurling the piston skirt
extended maximum power operation
applying load to a cold diesel engine
第10题：
Diesel engines have more advantages in comparison with gasoline engines
Diesel engines have more advantages in comparison to gasoline engines
Gasoline engines have more advantages in comparison with diesel engines
Gasoline engines have more advantages in comparison to diesel engines