terrella上的磁针指向北极,A。其他针也会这样做,即使terrella的表面不均匀,如在O.来自William Gilbert De Magnete,伦敦(Magnetic needles on a terrella will point towards the north pole, A. other needles will do likewise, even though the surface of the terrella is uneven, as at O. From William Gilbert De Magnete, London)威廉·吉尔伯特 |
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