6.土地退化有多种类型但不包括 A.烧荒导致土地荒芜 b.水土流失导致表土损失地形改变 C.大量农药使用导致土壤污染 D.过度放牧 Template




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tomski6.土地退化有多种类型但不包括 a.烧荒导致土地荒芜 b.水土流失导致表土损失地形改变 coloring