What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）

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  A . The Flinders bar B . The heeling magnet C . Quadrantal soft iron spheres D . Bar magnets in the binnacle

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• Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.

  A . fore-and-aft and athwartships magnets B . dip needle and heeling magnet C . heeling magnet and Flinders bar D . Flinders bar and quadrantal sphere

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• If the compass heading and the magnetic heading are the same then（）.

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• The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.

  A . They are not subject to permanent magnetism; no check is necessary B . Semiannually C . Annually D . Every five year

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• Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.

  A . deviation B . variation C . local attraction D . All of the above

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• The points on the earth’s surface where the magnetic dip is 90° are（）.

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• What is the basic principle of the magnetic compass?（）

  A . Magnetic materials of the same polarity repel each other and those of opposite polarity attract B . The Earth's magnetic lines of force are parallel to the surface of the Earth C . Magnetic meridians connect points of equal magnetic variation D . The compass needle(s) will，when properly compensated，lie parallel to the isogonic lines of the Earth

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• Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.

  A . induced magnetism in the vessel's horizontal soft iron B . change in the magnetic field when the vessel inclines from vertical C . permanent magnetism of the vessel D . magnetic fields caused by electrical currents in the vicinity

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• You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made（）.

  A . Flinders bar first，then the heeling magnet and spheres B . Heeling magnet first，then the Flinders bar and spheres C . Flinders bar first，then the spheres and heeling magnet D . Spheres first，then the Flinders bar and heeling magnet

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