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草地毒草灾害
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草地毒草灾害
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农学
草地毒草灾害
释
natural hazard in grasslands caused by poisonous herbaceous plants
草地毒草灾害
由于极端自然、人为因素或者它们的共同作用,使草地生态系统能量交换、物质循环、信息传递的有序状态遭到破坏,草地生态系统失衡,毒草抢占生态位的现象。
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uniform-density contraction
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uniform ergodic theorem
uniform error
uniform estimate
uniform family of coverings
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