Knowing the compass heading that is 90°to the side of a ship will enable the operator of a survival craft to initially steer（）.

A . variation B . deviation C . compass error D . drift

A . zero B . equal to variation C . eliminated by adjusting the compass D . constant at any geographical locatio

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 . 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、deviation B、annual rate of variation change C、precession D、compass error

A . the horizontal component of the permanent magnetism B . deviation caused by the vessel's inclination from the vertical C . induced magnetism in the horizontal soft iron D . induced magnetism in the vertical soft iro

A . vessel's geographic position B . vessel's heading C . earth's magnetic field D . influence of the magnetic materials of the vessel

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

A . be liable B . not be liable C . be paid D . not be paid

A . Similize B . Clock C . Synchronize D . Positio

A . geographical position B . speed C . heading D . longitude

A . compass error B . variation C . magnetic dip D . deviatio

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

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

A . if B . how C . when D . where

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 . 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 . Card B . Needle C . Lubber's line D . Gimbal

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 . placed in a fixed bracket when being used B . clamped to any position convenient for the coxswain to see it C . permanently mounted on the lifeboat's centerline D . mounted in the center of the boat to eliminate deviatio

此题为判断题(对，错)。