修建的长江三峡船闸是利用了 的原理在河流上修建拦河坝时把坝堤修建的上窄下宽的理由是 .——青夏教育精英家教�—— Template




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tomski修建的长江三峡船闸是利用了 的原理在河流上修建拦河坝时把坝堤修建的上窄下宽的理由是 .——青夏教育精英家教�—— coloring