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source of background radiation造句

"source of background radiation"是什么意思   

例句與造句

  1. The widespread construction of well insulated and sealed homes in the northern industrialized world has led to radon becoming the primary source of background radiation in some localities in northern North America and Europe.
  2. For purposes of comparison, the world average dose rate from naturally occurring sources of background radiation is 2.4 mSv per year, equal for practical purposes in this application to 2.4 mGy per year.
  3. It's difficult to find source of background radiation in a sentence. 用source of background radiation造句挺難的

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