A.speed being made good
B.speed through the water
C.the set of the current
D.the depth of the water
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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
A.dead reckoning
B.pilotage
C.great circle sailing
D.geographic navigation
A.blows the fire back toward the vessel
B.comes over the bow
C.comes over the stern
D.comes over either beam
A.cooling the outside bulkheads with water
B.shutting all sources of air into the compartment
C.closing the sea chest
D.flooding the compartment with salt water
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When the wave period and the apparent rolling period are the same（）.
Manoeuvring information can not be obtained from（）.
（）is on the panel of radar.
Berthing means bringing a vessel to her berth until（）.
Fog is likely to occur when there is little difference between the dew point and the（）.
How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）
In the Northern hemisphere northerly winds may cause temperature（）.
Which of the following is not a form of precipitation?（）
The circulation around a low pressure center in the Northern Hemisphere is（）.
The loading of the ship must be done in accordance with（）.