单选题:比较1984年以来径流量和输出量的变化趋势,可以看出流域内

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题目内容:
比较1984年以来径流量和输出量的变化趋势,可以看出流域内 A.气候变暖、变干的速度日益加快
B.水土保持和水利工程效益显著
C.地质灾害得到有效控制
D.水资源总量呈流动式下降
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