It is the unsolidified sediment consisting of disordered kaolinite and small amount organic matter and lignite materials.
常含少量有机质或与褐煤矿层等伴生。
牢固的It is the unsolidified sediment consisting of disordered kaolinite and small amount organic matter and lignite materials.
常含少量有机质或与褐煤矿层等伴生。
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