A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.

A . making a structural change to the vessel B . a short circuit near the compass C . belt buckles D . All of the above

A . If the quadrantal spheres are out as far as possible replace them with smaller spheres B . If the quadrantal spheres are in as far as possible remove one of the spheres C . If the quadrantal spheres are in as far as possible replace them with smaller spheres D . If the quadrantal spheres are out as far as possible，move the quadrantal spheres i

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

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 . 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 . Move the quadrantal spheres closer to the compass B . Raise the heeling magnet if the red end is up C . Remove some of the Flinders bar D . Raise or lower the athwartship magnet

A . the vessel's heading B . sea conditions C . seasons D . the vessel's positio

A . Heeling magnet B . Flinders bar C . Fore-and-aft magnets D . All of the above can be set on magnetic east or magnetic west heading

A . If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets. B . If the blue ends of the magnets are aft you should lower the fore-and-aft tray C . If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets D . If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnet

A . If the quadrantal spheres are all the way out，replace them with smaller spheres B . If the quadrantal spheres are all the way in，replace them with larger spheres C . If the quadrantal spheres are all of the way out，move the spheres in D . If the quadrantal spheres are all the way out，replace them with larger spheres.

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

A . before correcting for any deviation B . after correcting for variation C . after adjusting the fore-and-aft and athwartships permanent magnets D . before the quadrantal correctors are placed on the compa

A . hammering and jarring B . vibration and pounding C . varying magnetic fields D . stable or permanent magnetism of the shi

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 . Mysql＞ USE sakila; LOAD DATA INFILE 'sakila2013.sql'; B . Shell＞ mysql –u root –p sakila sakila2013.sql C . Shell＞ mysql import –u root –p sakila sakila2013.sql D . Shell＞ mysql –u root -p –e 'use sakila; source sakila2013.sql' E . Shell＞ mysql –u root –p –silent ＜ sakila2013.sql

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 . restricted in her ability to maneuver B . not under command C . engaged in mineclearing operations D . constrained by her draft

A . found in the center(s) of the compass rose(s) B . indicated by isogonic lines C . found in a note on the chart D . All of the above

A . from the still water plane to the crest B . from the still water plane to the trough C . from crest to trough D . between water levels at one-quarter of the wave's length

是 否