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 green buoy has a yellow triangle on it. This is a(n)（）.
An obstruction on a helodeck is any object that might present a hazard to the（）.
A fire is discovered in the bow of your vessel while making way. The wind is from ahead at 35 knots. You should（）.
Between 1830 hrs and 1850 hrs this day，strong gusty winds（）by my vessel，in consequence of which the vessel’s four mooring lines were broken.
A hand held instrument used to measure distances between objects and the ship is a（）.
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（）.
A flooded leg on a liftboat would adversely affect the vessel’s stability underway by（）.
A large basin cut into the shore，closed off by a caisson，and used for dry docking of ships is known as a（）.
A fishing vessel casualty must be reported to the Coast Guard if it involves（）.
A jack-up drilling rig being towed must（）.