A.a 2-second blast every 20 seconds
B.a 4-second blast every 20 seconds
C.an 8-second blast every 30 seconds
D.a 10-second blast every 30 seconds
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A.turn off all lights that interfere with the navigation lights
B.turn on all available working lights on deck
C.ring the bell rapidly for five seconds once a minute
D.display two black diamonds in a vertical line during the day
A.Aye Aye Sir
B.Right 15 degrees rudder
C.Rudder is right 15 degrees
D.No reply is necessary，just carry out the order
A.heavy-walled drill pipe
B.tool joint
C.down hole tool
D.drill collar
A.main brace
B.tow span
C.jockey bar
D.None of the above
A.one sidelight
B.one sidelight and a masthead light
C.one sidelight and two masthead lights
D.both sidelights of a vessel and her masthead light(s)
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Please supply 200 tons of fresh water（）my ship.
A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound（）.
A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by（）.
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A frame with two，or sometimes four，arms through which are threaded the guidelines and which is used to keep the drill stem and bit in line with the center opening in the temporary guide base is the（）.
Entries should be made in a Ro-Ro vessel’s cargo-securing device record book for（）.
For the purposes of cargo oil containment，the fixed container under the manifold of an eight-inch loading line must hold a minimum of（）.
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