如图是轮船通过三峡船闸的示意图,它是利用原理工作的,此时上游阀门a打开,下游阀门b关闭,和闸室构成此装置(选填“下游”或“上游”);阀门a左侧 Template


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tomski如图是轮船通过三峡船闸的示意图,它是利用原理工作的,此时上游阀门a打开,下游阀门b关闭,和闸室构成此装置(选填“下游”或“上游”);阀门a左侧 coloring