發送短信 : Incinerated sludge as aggregate for lightweight concrete

__    __     ___      _____    __   __   _____    
\ \\ / //   / _ \\   |__  //   \ \\/ // |  __ \\  
 \ \/ //   | / \ ||    / //     \ ` //  | |  \ || 
  \  //    | \_/ ||   / //__     | ||   | |__/ || 
   \//      \___//   /_____||    |_||   |_____//  
    `       `---`    `-----`     `-`'    -----`