文章还给出了两相同固体中界面声反射系数的表达式，介绍了测量界面劲度常数的超声反射谱方法。
Explicit expressions for the acoustic reflection coefficients from the interfaces are given and ultrasonic experiments for measuring the interface stiffness constants are described.
由于子元间的相似性，结构的整体劲度场中同一类型的结点，其劲度系数是相同的。
Because of the similarity of these sub-elements, the coefficients of stiffness for the nodes of the same zone (material) are equal in the whole stiffness field of the structure.
由于子元间的相似性，结构的整体劲度场中同一类型的结点，其劲度系数是相同的。
Because of the similarity of these sub-elements, the coefficients of stiffness for the nodes of the same zone (material) are equal in the whole stiffness field of the structure.
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