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单选题
A line connecting all possible positions of your vessel at any given time is a（）.
A
longitude line
B
latitude line
C
line of position
D
fix
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单选题Acknowledgement by you of receipt of a distress message from a vessel which，beyond any possible doubt，is not in your vicinity and is a long distance away must be made when（）.A
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all navigational aids to be usedD
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