单项选择题
A.spark plugs B.glow plugs C.heat of compression D.a magneto
For most ship engines，the fuel is（）.A.natural gasB.dies...
单项选择题For most ship engines，the fuel is（）.
A.natural gas B.diesel oil C.propane D.bunker fuel
Diesel engines obtain combustion air through turbo char...
单项选择题Diesel engines obtain combustion air through turbo chargers，blowers，or（）.
A.air starters B.carburetors C.natural aspiration D.air receivers
Diesel engines are considered safer than gasoline engin...
单项选择题Diesel engines are considered safer than gasoline engines because（）.
A.they are more heavily built B.the fuel used is less volatile C.they can be easily reversed D.they operate at a lower speed
