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
After sending a message describing the symptoms of an ill crew member，you receive a message containing the code MRL. This means（）.
Cargo transfer operations on a tank vessel need NOT be stopped when（）.
A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called 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 hand held instrument used to measure distances between objects and the ship is a（）.
A fishing vessel casualty must be reported to the Coast Guard if it involves（）.
A fire pump may be used for other purposes if（）.
A helmsman receives the command “Right 15 degrees rudder.”The helmsman’s IMMEDIATE reply should be（）.
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.
How could lashing gear used aboard Ro-Ro vessels be stowed when not in use? （）