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Wednesday 11 August 2021
Modul PJJ IPA Kelas 9 Semester Genap
About Mark
Chemistry for Us is created by Mr. Mark. I am a Physics and Chemictry Teacher of Lower Secondary and Upper Secondary. I experinced about 15 years of teaching, and also experinced in manufactured, especially in Quality Control and also Human Resources. I do love chemistry, so I apply chemistry in my daily life.
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