If you are replacing the bottom element, remove the accumulated sediment on the bottom of the tank.
如果是拆卸下部加热元件，需要清除累积在内胆底部的沉淀物。
In the eutrophication process of Wuli lake, large amount of nitrogen, phosphorous and organic matter accumulated in the sediment of the lake bottom.
在五里湖富营养化过程中，氮、磷及有机物质在湖底沉积物中大量积累。
It is found that the relationships between the accumulated volumes of sediment deposition in the reservoir and the average pool levels follow the earlier trend curves very well.
发现实施过渡方案以来，库区累计淤积量与叠加流量加权平均坝前水位的关系，符合以往的关系曲线。
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