發送短信 : Stress waves in functionally gradient materials and its use for material characterization

  _  _     _____      _____     ___              
 | \| ||  |  ___||   / ___//   / _ \\      ___   
 |  ' ||  | ||__     \___ \\  / //\ \\    /   || 
 | .  ||  | ||__     /    // |  ___  ||  | [] || 
 |_|\_||  |_____||  /____//  |_||  |_||   \__ || 
 `-` -`   `-----`  `-----`   `-`   `-`     -|_|| 
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