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SEM analysis identifies spherical particles as well as irregular particles in both dust and topsoil, which indicates input of magnetic particles derived coal combustion.
扫描电镜分析表明，除了不规则的磁性颗粒外，尘土与表土中均发现了球状颗粒，说明二者均含有来自工业燃煤释放的磁性颗粒。
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