A.flame stopper
B.flame screen
C.flame filter
D.flame restrictor
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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
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
最新試題
When steering by autopilot,how often should the steering be checked?（）
How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）
Your vessel is docking, but not yet alongside. Which line will be the most useful when maneuvering the vessel alongside the pier?（）.
The company should establish and maintain procedures to control all documents and date which are relevant to（）.
It is dangerous for vessels without the operational radar（）the estuary.
（）is on the panel of radar.
ECDIS must be able to perform all of the following EXCEPT（）.
A tide is called diurnal when（）.
Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
Berthing means bringing a vessel to her berth until（）.