發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : On the use of rate-less codes in underwater acoustic file transfers