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磷酸脲
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urea phosphate
磷酸脲
磷酸与尿素在一定条件下反应生成的磷酸复盐。分子式为H3PO4·CO(NH2)2。含44.9%P2O5,含17.7%N。为无色透明棱柱状晶体,熔点117.3℃。易溶于水,46℃时每升水溶解磷酸脲202克,水溶液呈酸性,1%水溶液的pH为1.89。
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flood monitoring by remote sensing
flood of Haihe River in 1939
flood of Huanghe-huaihe-haihe-changjiang Four Rivers in 1662
flood of middle reaches of the Yellow River in 1843
flood of Yangtze River and Huaihe River in 1931
flood of Yangtze River in 1935
flood period
flood plain
floodplain
flood plainhirst
flood plain subfacies
flood prevention
flood protection area of urban
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