A.detachable link
B.stud link
C.Kenter link
D.connection link
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A.flame stopper
B.flame screen
C.flame filter
D.flame restrictor
A.enlarge bit
B.casing bit
C.hole opener
D.casing opener
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
最新試題
Which of the following is not a form of precipitation?（）
Berthing means bringing a vessel to her berth until（）.
（）is on the panel of radar.
It is dangerous for vessels without the operational radar（）the estuary.
The circulation around a low pressure center in the Northern Hemisphere is（）.
In the Northern hemisphere northerly winds may cause temperature（）.
Bales close to the deckhead should be covered to prevent（）.
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.
The company should establish and maintain procedures to control all documents and date which are relevant to（）.