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莒县共有21个水力侵蚀野外调查单元,为保障该项工作的顺利进行,该县采取分区分块、定人定责等措施,确保了调查工作的进度和质量。
There are 21 units of water erosion field investigation in Yixian County. To ensure the smooth progress of the work, the county adopts such measures as subdivision of blocks and appointment of individuals to ensure the progress and quality of investigations.