發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Trace analysis by combined use of off-line solid-phase extraction, on- column sample focusing and U-shape flow cell in capillary liquid chromatography