13.三峡船闸是世界上最大的人造连通器下图是轮船通过船闸的示意图此时上游阀门a打开下游阀门b关闭下列说法正确的是 A.闸室和 Template




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tomski13.三峡船闸是世界上最大的人造连通器下图是轮船通过船闸的示意图此时上游阀门a打开下游阀门b关闭下列说法正确的是 a.闸室和 coloring