發送短信

數:

提供者:

CAPTCHA:

  _____    __   __    ______    ______    ______  
 /  ___||  \ \\/ //  /_   _//  /_   _//  /_   _// 
| // __     \ ` //     | ||     -| ||-   `-| |,-  
| \\_\ ||    | ||     _| ||     _| ||_     | ||   
 \____//     |_||    /__//     /_____//    |_||   
  `---`      `-`'    `--`      `-----`     `-`'

Please enter what you see:

發送短信 : wave scattering of interior vertical crack in plates and the detection of the crack