發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Phase-preserving linear amplifiers not simulable by the parametric amplifier