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
The company should establish and maintain procedures to control all documents and date which are relevant to（）.
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
The helm command PORT TWENTY means（）.
The ISM code is part of（）.
（）is on the panel of radar.
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（）.
Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）
When the wave period and the apparent rolling period are the same（）.
The mean draft of a ship is the draft（）.
（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.