Heavy metals such as mercury ( Hg), cadmium ( Cd), lead ( Pb), chromium ( Cr) and arsenic ( As) exist only at a low concentration in the environment.

  • 重金属比如汞、镉、铅、铬和砷在环境中含量很低。

  • 互联网摘选 2025-01-19 23:24:48

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