大坝是堵水吗? 如果从年平均来说,上游来的水,一滴不少都流到了下游 (当然夸张了点,还要考虑蒸发掉的),这也叫堵?
大坝是堵水吗? 如果从年平均来说,上游来的水,一滴不少都流到了下游 (当然夸张了点,还要考虑蒸发掉的),这也叫堵?
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