單項選擇題The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A.variation
B.compass error
C.deviation
D.earth's magnetic force
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1.單項選擇題The routing system which aimed at reducing the risk of casualties is called as（）.
A.traffic separation schemes
B.recommended tracks
C.precautionary areas
D.inshore traffic zones
2.單項選擇題The ship has a list of 5 degrees（）starboard.
A.on
B.to
C.for
D.of
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