短語詞組短語random elastic restriction element 隨機(jī)約束彈性單元elastic spring element model 彈簧單元elastic sealing element 彈性密封件elastic key element 彈性要素elastic sensitive element 彈性敏感元件elastic finite element 彈塑性有限元elastic finite element method 彈性有限元法elastic damping element 彈性阻尼環(huán)節(jié)elastic plate element 彈性要素 返回 elastic element