發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Ground response to dynamic compaction of dry sand