Judging controllability is an important study problem of modern control theory, it is also a theoretical foundation in systems of analysis and design.

能控性判定问题是现代控制论研究的重要课题，它是系统分析和设计的理论基础。

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Design methods of pile foundation based on the principle of settlement control are a main achievement of the modern theory of interaction between pile and soil.

以变形控制为原则的桩基础设计是现代桩土相互作用理论的主要成果之一。

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