Low density sampling and mixed sample analysis are dealt with in this paper.
讨论了化探低密度采样和混样分析问题。
Studies show that surface sediments of the flood land seem to be the best sampling media in ultra-low density geochemical investigation in forest-swamp areas.
研究成果表明，河漫滩表层沉积物是森林超低密度地球化学调查的最佳采样介质。
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