發送短信

數:

提供者:

CAPTCHA:

  ____       ___               __   __    ____    
 |  _ \\    / _ \\      ___    \ \\/ //  |  _ \\  
 | |_| ||  / //\ \\    /   ||   \ ` //   | |_| || 
 | .  //  |  ___  ||  | [] ||    | ||    | .  //  
 |_|\_\\  |_||  |_||   \__ ||    |_||    |_|\_\\  
 `-` --`  `-`   `-`     -|_||    `-`'    `-` --`  
                         `-`

Please enter what you see:

發送短信 : Comparison of IEEE and IEC standards for calculations of insulation levels and electrical clearances for 230 kV air insulated substation