A.flame stopper
B.flame screen
C.flame filter
D.flame restrictor
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A.enlarge bit
B.casing bit
C.hole opener
D.casing opener
A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground
A.speed being made good
B.speed through the water
C.the set of the current
D.the depth of the water
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
A.has left hand twist
B.has inside threads on both ends
C.has outside threads on both ends
D.takes two men to operate
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Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
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The circulation around a low pressure center in the Northern Hemisphere is（）.
Full details of all lights and fog signals are shown on（）.