A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground
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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
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
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The dew point temperature is（）.
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
The ISM code is part of（）.
Manoeuvring information can not be obtained from（）.
（）is where the crew eat their meals.
When steering by autopilot,how often should the steering be checked?（）
The loading of the ship must be done in accordance with（）.
According to the relevant regulation, lifeboat should be powered by（）.
Berthing means bringing a vessel to her berth until（）.
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.