mache
英 ['mɑ:ʃeɪ] 美 ['mɑʃeɪ]

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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