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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A.Light blue haze
B.Light brown haze
C.Light gray haze
D.Perfectly clear
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
A.Cylinder head valves
B.Ports
C.Turbo chargers
D.Bleeder valves
A.spark plugs
B.glow plugs
C.heat of compression
D.a magneto
A.natural gas
B.diesel oil
C.propane
D.bunker fuel
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Sudden unloading of a diesel engine can cause（）.
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