When there was cushion layer, the material gradation of cushion layer have effect on the tamp energy's transfer.
分析存在垫层时，垫层材料的级配对夯击能量的传递效果；
Finally, the cushion layer design criterion satisfying the best pressure reducing effect is...
最后提出了满足最佳减压效果的垫层料设计准则。
Finally, the cushion layer design criterion satisfying the best pressure reducing effect is...
最后提出了满足最佳减压效果的垫层料设计准则。
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