發送短信 : Characterization of diatomite, leonardite and pumice

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