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 large basin cut into the shore，closed off by a caisson，and used for dry docking of ships is known as a（）.
A jack-up drilling rig being towed must（）.
A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind （）.
An inert gas system on a tanker should be used to（）.
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（）.
How could lashing gear used aboard Ro-Ro vessels be stowed when not in use? （）
A large vessel is equipped with a controllable pitch propeller. Which statement is TRUE?（）
Cargo transfer operations on a tank vessel need NOT be stopped when（）.
A head-on situation at night is one in which you see dead ahead a vessel showing（）.