發送短信

數:

提供者:

CAPTCHA:

 _    _    _    _    _    _      ___      _  _   
| || | || | || | || | |  | ||   / _ \\   | \| || 
| || | || | || | || | |/\| ||  | / \ ||  |  ' || 
| \\_/ || | \\_/ || |  /\  ||  | \_/ ||  | .  || 
 \____//   \____//  |_// \_||   \___//   |_|\_|| 
  `---`     `---`   `-`   `-`   `---`    `-` -`

Please enter what you see:

發送短信 : Achieving 2.2 GPa ultra-high strength in low-alloy steel using a direct quenching and partitioning process