發送短信 : Nanostructured single-crystalline twin disks of zinc oxide

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 |__  //   /_   _// | |  | ||  |  ___|| |      \\ 
   / //     -| ||-  | |/\| ||  | ||__   |  --  // 
  / //__    _| ||_  |  /\  ||  | ||__   |  --  \\ 
 /_____||  /_____// |_// \_||  |_____|| |______// 
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