单项选择题

The magnetic compass operates on the principle that（）.

A.like magnetic poles attract
B.unlike magnetic poles repel
C.unlike poles attract
D.the poles of the compass line up with the geographic poles of the earth

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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

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