单项选择题

Magnetic compass deviation（）.

A.varies depending upon the bearing used
B.is the angular difference between magnetic north and compass north
C.is published on the compass rose on most nautical charts
D.is the angular difference between geographic and magnetic meridians

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单项选择题

（）is on the panel of DF.

A.RINGS INT
B.SWEEP INT
C.REPEATER
D.GONIOMETER

单项选择题

（）is on the panel of DF.

A.ZERO CLEARING
B.ANTI-CLUTTER-RAIN
C.DIMMER
D.CURSOR