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
A tide is called diurnal when（）.
How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）
Before any loading takes place any signs of the previous cargo should do（）.
The helm command PORT TWENTY means（）.
When the wave period and the apparent rolling period are the same（）.
What is it called when it is possible to ignite the vapour above the oil?（）
In the Northern hemisphere northerly winds may cause temperature（）.
When steering by autopilot,how often should the steering be checked?（）
Which of the following is not an operation mode of AIS?（）
Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）