单项选择题

If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE? （）

A.Compass error and variation are equal
B.Compass north will be true north
C.Variation will equal deviation
D.There will be no compass error

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单项选择题
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.

A.permanent magnetism
B.subpermanent magnetism
C.induced magnetism
D.variable magnetism
单项选择题
If the magnetic heading is greater than the compass heading，the deviation is（）.

A.east
B.west
C.north
D.south
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