... 闭路电视 closed circuit television; CCTV 通路工作 closed circuit working 通路（线）圈 closed coil ...
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closed-circuit working 闭路工作
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The common characteristic features of this method is to deal with the working conditions of the designed maximum discharge of closed circuit and then to determine the pipe diameters and water head.
方法的共同特点是先找出管网输配最大流量的工况，然后确定管径及水压。
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