上面说得对,就算不计成本地改变河道,也对下游没什么影响。长江源头才有多少水?主要是嘉陵江和汉水这些支流。
上面说得对,就算不计成本地改变河道,也对下游没什么影响。长江源头才有多少水?主要是嘉陵江和汉水这些支流。
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