The total magnetic effects which cause deviation of a vessel’s compass can be broken down into a series of components which are referred to as（）.

A . An agonic line B . The magnetic equator C . A magnetic meridian D . All of the above

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

A . Quadrantal spheres B . Heeling magnets C . Athwartships magnets D . Fore-and-aft magnet

A . geographic pole and the magnetic pole B . lubber's line and true north C . horizontal and the magnetic line of force D . compass heading and the magnetic heading

A . the deviation has been offset by the variation B . there is something wrong with the compass C . the compass is being influenced by nearby metals D . there is no deviation on that heading

A . voltage B . current C . power D . frequency

A . induced magnetism in vertical soft iron B . induced magnetism in horizontal soft iron C . permanent magnetism in ship's steel D . vessel's inclination from the vertical

A . Flinders bar should be inverted B . Heeling magnet should be inverted C . The quadrantal spheres should be rotated 180° D . Flinders bar should be moved to the opposite side of the binnacle

A . compass error B . latitude C . variation D . deviatio

A . increases B . remains the same C . decreases D . is unimportant and may be neglected

A . will add to B . will subtract from C . may add to or subtract from D . will not change

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

A . Along the magnetic equator B . Connected by the isoclinal line C . The isopors D . The magnetic pole

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

A . compass north B . the direction of the vessel's head C . magnetic north D . a relative bearing taken with an azimuth circle

A . elevation B . magnetic angle C . vertical angle D . di

A . the lines of force cross the equator on a 0°-180°alignment B . the quadrantal error is 0° C . there is no vertical component of the Earth's magnetic field D . the intercardinal headings have less than 1&deg

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

A . anchor chain B . wire rope C . connecting links D . pendant wire

A . It compensates for the error caused by the vertical component of the Earth's magnetic field B . It compensates for error caused by the heeling of a vessel C . It compensates for quadrantal deviation D . It is only needed in equatorial water

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

A．the movement deep inside the Earth B．the periodically reverses of the Earth C．the force coming from outer space D．the mechanical movement of the Earth 此题为多项选择题。

A. about B. of C. to