head bay
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其第一级上闸首人字门的淹没水深达35米。
The immersed water depth of the upper miter gate at first step is up to 35 meters.
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三峡工程—临时船闸上闸首、下闸首船闸液压系统总成。
Three Gorges Project-Upper and lower lock heads for the temporary ship lock Ship lock hydraulic system assembly.
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