However, the contents of radioactive nuclides such as uranium, radium and thorium are high in some boun coal and its products.

  • 石煤中U、Th等放射性核素含量高,致使部分石煤及其制品中U、Th等放射性核素含量偏高。

  • 互联网摘选 2026-07-14 02:51:43

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