首先，基于历史冰情资料，分析了黄河内蒙古段的凌情特征。
Firstly, the ice slush characteristics of Yellow River Inner Mongolia reach are analyzed from history datum.
系统地采集黄河内蒙古段上覆水、悬浮物和底泥样品，分析其中重金属元素的含量。
Samples of overlying water, suspended particles and bed mud in the Inner Mongolia stretch of the Yellow River were collected systemically and their heavy metal element contents were analysed.
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