单项选择题

The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.

A.north magnetic pole
B.south magnetic pole
C.magnetic prime vertical meridian
D.magnetic equator

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单项选择题
The lubber’s line on a magnetic compass indicates（）.

A.compass north
B.the direction of the vessel's head
C.magnetic north
D.a relative bearing taken with an azimuth circle
单项选择题
The lubber’s line of a magnetic compass（）.

A.always shows true north direction
B.indicates the vessel's heading
C.is always parallel to the vessel's transom
D.is located on the compass card
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