And the advent of the unified strength theory solves this question properly. 統一強度理論的出現很好地解決了這一問(wèn)題。
Given a proper parameter, fourth criterions among the five classical strength theories could be described by the formula. 適當地選取該準則中的參數，該準則可以包含五大強度理論中的四個(gè)。
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