In urban gas network with multiple pressure ranges, there is an optimal effect radius, for which the annual calculating cost is minimal.
在城市燃气多级管网系统中，存在一个调压室的最佳作用半径，这时管网系统的年计算费用为最小。
In urban gas network with multiple pressure ranges, there is an optimal effect radius, for which the annual calculating cost is minimal.
在城市燃气多级管网系统中，存在一个调压室的最佳作用半径，这时管网系统的年计算费用为最小。
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