A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
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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
A.contaminating food with extinguishing agent
B.shutting all sources of air into the compartment
C.closing the sea chest
D.a grease fire in the ventilation system
最新試題
Manoeuvring information can not be obtained from（）.
How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）
Where would you find information about the time of high tide at a specific location on a particular day of the year?（）
Fog is likely to occur when there is little difference between the dew point and the（）.
A tide is called diurnal when（）.
The dew point temperature is（）.
The loading of the ship must be done in accordance with（）.
Which of the following is not a form of precipitation?（）
When the wave period and the apparent rolling period are the same（）.
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.