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问题

The Flinders bar and the quadrantal sp


The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval().

  • AThey are not subject to permanent magnetism; no check is necessary
  • BSemiannually
  • CAnnually
  • DEvery five year
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分类:磁罗经与陀螺罗经的使用题库