upstream gate
上游闸门门槽 upper gate recess
上游船闸门 upper gate ; Gate upper
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本文首先分析了闸门的调节过程，然后给出了上游常水位闸门和下游常水位闸门工作的数学模型。
In this paper, the governing process of gates is firstly analysed, and then the mathematical models of the operation of upstream constant level gate and that of downstream one are given.
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