be replaced with 谁代替谁? 意思就是, 2y 和 sy 比较,谁的值小就在公式中就取用谁。 这样理解,原文应该这样写: when selecting gaskets for flanges over nps 60 or other custom design flanges, if 2y (where y is the minimum gasket seating stress) exceeds the gasket-surface material yield stress (flange, or cover), the yield stress of the material used for the flange or cover shall be replaced with the term 2y in the equation for nmin: 但这样替代关系正好与原句相反。 查看更多