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Research Article

Yazachew Alemu Tenaw

Debre Markos College of Teacher Education, Chemistry Department, P.O.Box 428 Debre Markos, Ethiopia.

Email: yazachew3@gmail.com. Tel. +251911709855, Fax. +251587714836.

, 2015, 3(1), 1-6;

Received : 14 Jul 2015 / Accepted : 13 Feb 2025 / Published : 14 Jul 2015

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