单项选择题
The phrase when built in the certificate of vessel’s nationality definitely means（）.
A.when was your vessel built
B.at what time is your vessel building
C.when is your vessel built
D.at what time you built your vessel
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A.port of call
B.port of embarkation
C.port of destination
D.port of disembarkation -
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The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A.variation
B.compass error
C.deviation
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The routing system which aimed at reducing the risk of casualties is called as（）.
A.traffic separation schemes
B.recommended tracks
C.precautionary areas
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