發送短信 : Lightweight geopolymer made of highly porous siliceous materials with various Na<inf>2</inf>O/Al<inf>2</inf>O<inf>3</inf>and SiO<inf>2</inf>/Al<inf>2</inf>O<inf>3</inf>ratios

 __   __    ______    _  _    _    _    ______   
 \ \\/ //  /_   _//  | \| || | || | || |      \\ 
  \   //    -| ||-   |  ' || | || | || |  --  // 
  / . \\    _| ||_   | .  || | \\_/ || |  --  \\ 
 /_//\_\\  /_____//  |_|\_||  \____//  |______// 
 `-`  --`  `-----`   `-` -`    `---`   `------`