单项选择题

By convention，the north seeking ends of a compass’ magnets are colored（）.

A.Black
B.Blue
C.Red
D.White

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单项选择题A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°.Which action should be taken to remove this error during compass adjustment（）.

A.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets
B.If the blue ends of the magnets are aft you should lower the fore-and-aft tray
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D.stable or permanent magnetism of the ship

磁罗经与陀螺罗经的使用

By convention，the north seeking ends of a compass’ magnets are colored（）.