3.1.7水土流失规律 law of soil erosion and water loss 3.1.8容许土壤流失量 soil loss tolerance 3.1.9水土保持 soil and water conservation ..
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... 容许统计假设 admissibe statistical hypothesis 容许土壤流失量 permissible soil loss 容许弯曲应力 allowable bending stress ...
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