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K�nh g***7917;i c�c Anh Ch***7883;
Em l***7845;y ***273;***7845;t b�n t***7915; n***432;***7899;c th***7843;i ***273;� qua x***7917; l� b***7857;ng polymer c� t�n l� polyacrylamid cation ***273;***7875; tr***7891;ng c�y c***7843;nh, nh***432;ng c�y c***7913; l***7909;i d***7847;n.
Nh***432;ng c***361;ng lo***7841;i ***273;***7845;t b�n n�y sau c***417;n m***432;a th� tr***7891;ng c�y l***7841;i l�n t***7889;t. Anh ch***7883; n�o bi***7871;t m�ch gi�m em v***7899;i.
Em xin c***7843;m ***417;n