本地纯净下载
纯净官方版九游会J9甘肃是黄河流域重要的水源涵养区和补给区,肩负着黄河中上游生态修复、水土保持和污染防治的重任。定西地处黄河上游,位于甘肃中部,为黄土高原、青藏高原和西秦岭交汇带,是黄河最大支流渭河的发源地,也是黄河上游最大支流洮河以及重要支流关川河的水源涵养区、补给区。。
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