如图轮船由下游经过船闸驶往上游.船进入闸室后先关闭阀门b和闸门d再打开阀门a此时上游和闸室组成连通器当闸室中水位与上游水位相平时 Template




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tomski如图轮船由下游经过船闸驶往上游.船进入闸室后先关闭阀门b和闸门d再打开阀门a此时上游和闸室组成连通器当闸室中水位与上游水位相平时 coloring