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在现场综合查勘和地形图套绘比较的基础上 ,分析了黑龙江干流因冲刷坍岸造成国土流失的严重性及其成因
On the basis of comprehensive survey and topographical map comparison on the spot, the author analyzed the seriousness and cause of the territorial loss caused by the collapse of the main stream in Heilongjiang Province