A.diverter bit
B.hole reamer
C.core bit
D.conventional bit
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A.A flashing amber light
B.A fixed red light
C.A white flag raised and lowered vertically
D.A flashing white light
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
A.heavy
B.easily damaged
C.affected by temperature
D.costly relative to the strength ratio
A.stopper
B.screen
C.filter
D.restrictor
A.rising warm air
B.proximity to a low pressure area
C.inward spiraling circulation
D.clear dry weather
最新試題
A fire is discovered in the bow of your vessel while making way. The wind is from ahead at 35 knots. You should（）.
A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound（）.
For the purposes of cargo oil containment，the fixed container under the manifold of an eight-inch loading line must hold a minimum of（）.
A flooded leg on a liftboat would adversely affect the vessel’s stability underway by（）.
A jack-up drilling rig being towed must（）.
A safe fuel system must（）.
A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.
After sending a message describing the symptoms of an ill crew member，you receive a message containing the code MRL. This means（）.
All ships（）suspected infectious disease on board should radio information to Port Health Officer.
Entries should be made in a Ro-Ro vessel’s cargo-securing device record book for（）.