读下图回答: (1)黄河下游的“地上河”是怎样形成的? _____________________________
读下图回答:(1)黄河下游的“地上河”是怎样形成的?___________________________________________________________...
读下图回答: (1)黄河下游的“地上河”是怎样形成的? ________________________________________________________________________________________ ________________________________________________________________________________________ (2)综合治理黄河需要采取哪些措施? ________________________________________________________________________________________ ________________________________________________________________________________________ (3)现在黄河下游断流现象日趋严重,想一想,造成黄河断流的人为原因有哪些? ________________________________________________________________________________________ ________________________________________________________________________________________
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