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p-m

英['piː'em] 美['piː'em]
  • 永久磁铁

详细释义

名词 pm:
  1. an examination and dissection of a dead body to determine cause of death or the changes produced by disease

  2. a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium

  3. the person who holds the position of head of the government in the United Kingdom

  4. modulation of the phase of the carrier wave

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