...四参数准则；五参数准则；角隅模型 [gap=892]keywords: double shear stress; three parameters criteria; four parameters criteria; five parameters criteria; corner model ..
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在新的力学模型上建立了三种类型的四参数强度准则。
Three types of four-parameter strength criterion based on new mechanical model are proposed.
第四章介绍了取样器安全性准则，主要包括保真取样器稳定性理论及取样器释放参数的定性分析及新型销轴式连接方式。
Chapter 4 mainly illuminates safety sampling technique, including theory of corer tube stability, qualitative analysis of parameters of corer releasing and a new type connection of plug pin.
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