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
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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
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A.main brace
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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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Permanent magnetism is caused by（）.
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Entries should be made in a Ro-Ro vessel’s cargo-securing device record book for（）.
Please supply 200 tons of fresh water（）my ship.
All ships（）suspected infectious disease on board should radio information to Port Health Officer.
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