أرسل هذا في رسالة قصيرة: Photocatalytic destruction of methyl orange by titanium dioxide powder synthesized by an oxalate co-precipitation method

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/ //---`'  | ||__    `-| |,-   | ||__   |  --  // 
\ \\___    | ||__      | ||    | ||__   |  --  \\ 
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  `----`   `-----`     `-`'    `-----`  `------`