單項(xiàng)選擇題If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur?（）

A.A pawl，forced by a spring mechanism，will engage the teeth of the bull gear and hold the load
B.An electromagnetic brake will hold the load where it is suspended
C.The load will fall rapidly to the deck unless the foot brake is engaged
D.The load will slowly lower to the deck under control of the drag of the winch motor


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1.單項(xiàng)選擇題How would the exhaust of a properly operating diesel engine appear?（）.

A.Light blue haze
B.Light brown haze
C.Light gray haze
D.Perfectly clear

2.單項(xiàng)選擇題How should you warm up a diesel engine that has not been run for some time? （）

A.Run it at minimum speed for a period of time
B.Run it at half speed for a period of time
C.Bring it to top speed immediately
D.Inject ether into the air intake

3.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

4.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

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

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