A.enlarge bit
B.casing bit
C.hole opener
D.casing opener
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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
A.dead reckoning
B.pilotage
C.great circle sailing
D.geographic navigation
最新試題
（）is on the panel of radar.
How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
（）is where the crew eat their meals.
The mean draft of a ship is the draft（）.
The helm command PORT TWENTY means（）.
What is it called when it is possible to ignite the vapour above the oil?（）
ECDIS must be able to perform all of the following EXCEPT（）.
The circulation around a low pressure center in the Northern Hemisphere is（）.
Bales close to the deckhead should be covered to prevent（）.