mache

听听怎么读
英 ['mɑ:ʃeɪ]
美 ['mɑʃeɪ]
是什么意思
  • n.

    马谢(量镭的单位,空气或液体所含氡的浓度单位);

  • 英英释义

    Mache

    • Mache (symbol ME from German Mache-Einheit, plural Maches) is an obsolete unit of volumic radioactivity named for the Austrian physicist Heinrich Mache. It was defined as the quantity of radon (ignoring its daughters; in practice, mostly radon-222) per litre of air which ionises a sustained current of 0.

    以上来源于:Wikipedia

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