What is used to correct for both induced and permanent magnetism,and consequently must be readjusted with radical changes in latitude().

A . Flinders bar B . Soft iron spheres C . Fore-and-aft permanent magnets in their trays D . Heeling magnet

时间:2022-10-10 07:58:00 所属题库:磁罗经与陀螺罗经的使用题库

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