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在土壤普查中,县一级的制图工作是一项繁重的任务。在野外调查开展以前要准备好大比例的工作底图(一式几份)或航测镶
In the soil census, cartographic work at the county level is a heavy task. In the field investigation carried out before the preparation of a large proportion of work under the map (in a few copies) or aerial survey