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分段低压输水系统是一种结构相对简单，采用分段降低水头的新型自流有压引水结构，而保水堰则是分段低压输水系统的关键建筑物。
The stepped low-pressurized water diversion system is a new type of gravity water supply system, which is simple in structure and water conservation weir is the pivotal structure.
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