發送短信

數:

提供者:

CAPTCHA:

 _    _    _    _   __    __   _    _    _    _   
| |  | || | || | || \ \\ / // | || | || | \  / || 
| |/\| || | || | ||  \ \/ //  | || | || |  \/  || 
|  /\  || | \\_/ ||   \  //   | \\_/ || | .  . || 
|_// \_||  \____//     \//     \____//  |_|\/|_|| 
`-`   `-`   `---`       `       `---`   `-`  `-`

Please enter what you see:

發送短信 : Acoustic impedance and electromechanical coupling coefficient of 2-2 parallel connectivity barium titanate piezoelectric ceramic-Portland cement composites