單項(xiàng)選擇題How does combustion air enter the cylinder of a two-cycle diesel engine?（）

A.Cylinder head valves
B.Ports
C.Turbo chargers
D.Bleeder valves


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1.單項(xiàng)選擇題Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.

A.spark plugs
B.glow plugs
C.heat of compression
D.a magneto

2.單項(xiàng)選擇題For most ship engines，the fuel is（）.

A.natural gas
B.diesel oil
C.propane
D.bunker fuel

3.單項(xiàng)選擇題Diesel engines obtain combustion air through turbo chargers，blowers，or（）.

A.air starters
B.carburetors
C.natural aspiration
D.air receivers

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Before starting any diesel or gasoline engine，which of the following must be checked? （）

A.Oil level
B.Flow of cooling water
C.Exhaust discharge
D.All of the above