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结合第四箱体渗漏试验装置设计方案的确定，给出了一种在若干设计方案中如何选出制造费用最低的方案的一种分析方法─单元价格比较法。
Combined with the determination of the design scheme of the fourth tank leakage test device, an analysis method of how to choose the lowest manufacturing cost among several design schemes ─ unit price comparison method is given.