A、A.They are not subject to permanent magnetism; no check is necessary
B、B.Semiannually
C、C.Annually
D、D.Every five years
更多“The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.”相关的问题
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
A、fore-and-aft and athwartships magnets B、dip needle and heeling magnet C、heeling magnet and Flinders bar D、Flinders bar and quadrantal spheres
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、A.Flinders bar B、B.transverse magnets C、C.fore-and-aft magnets D、D.soft iron spheres on the sides of the compass
A、The Flinders bar B、The heeling magnet C、Quadrantal soft iron spheres D、Bar magnets in the binnacle
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 magnets
A、The soft iron spheres on the arms of the binnacle B、Magnets placed in trays inside the binnacle C、A single vertical magnet beneath the compass D、The Flinders bar
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 headings
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