大壩是堵水嗎? 如果從年平均來說,上遊來的水,一滴不少都流到了下遊 (當然誇張了點,還要考慮蒸發掉的),這也叫堵?
大壩是堵水嗎? 如果從年平均來說,上遊來的水,一滴不少都流到了下遊 (當然誇張了點,還要考慮蒸發掉的),這也叫堵?
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