發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Behaviour of different strength concrete at elevated temperatures