The chemical properties of rare earth element are introduced, and the preparation of water treatment flocculants by using the rare earth is summarized.
介绍了稀土元素的化学性质，在制备水处理絮凝剂方面的研究和应用情况。
Oxygen, the most abundant chemical element, is present in combination with hydrogen to the extent of 89 percent in water.
在水中，氧这种最丰富的化学元素与氢结合，其含量多达89%。
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