A.stop the ventilation
B.sound the general alarm
C.determine the source of the fire
D.attempt to extinguish the fire
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A.permit the passage of vapor but not of flame
B.prevents the passage of flammable vapors
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank
A.generators
B.oil drums
C.the bridge controls
D.combustible metals
A.soild materials such as wood or bales of fiber
B.flammable liquids
C.a piece of electrical equipment
D.combustible metallic solids
A.water
B.foam
C.the range hood extinguishing system
D.fire dampers
A.punt used for painting over the side
B.small, reciprocating steam engine
C.spool-shaped drum fitted on a winch
D.swinging derrick
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Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
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The helm command PORT TWENTY means（）.
Fog is likely to occur when there is little difference between the dew point and the（）.
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