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
Full details of all lights and fog signals are shown on（）.
（）is where the crew eat their meals.
Before any loading takes place any signs of the previous cargo should do（）.
Fog is likely to occur when there is little difference between the dew point and the（）.
A tide is called diurnal when（）.
The circulation around a low pressure center in the Northern Hemisphere is（）.
What is a CORRECT reply to a pilot’s request, How’s your heading?（）
Which of the following is not a form of precipitation?（）
Berthing means bringing a vessel to her berth until（）.
Manoeuvring information can not be obtained from（）.