By comparing the isolation period with the critical and maximum periods, the limit ratio can be obtained by using the corresponding formulas.

将隔震结构的周期与临界周期和最大隔震周期比较，就可以得到相应高宽比限值的表达式。

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So there exists a critical period, at which, the limit ratio reaches its maximum value.

因此，存在一个临界周期使高宽比限值取得极大值。

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According to the theory on stock column skeleton of BF and the economic analysis of injection, a new concept on limit of injected coal and critical replacement ratio is proposed.

根据料柱骨架理论和喷煤技术经济分析，提出了高炉喷煤极限和临界置换比的新概念；

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