短語詞組短語elastic constraint ratio 彈性約束系數(shù)elastic modular ratio 彈性模量比elastic ship ratio 彈性滑動率dimensionless elastic constant ratio 無量綱彈性常數(shù)比elastic slip ratio 彈性滑動率elastic constant ratio 彈性比elastic elongation ratio 彈性伸長率elastic region ratio 彈區(qū)比 返回 elastic ratio