發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : NDT coil sensor design and raw signal processing for rail crack detection