hay this is my first thread and iam sorry for 2 things :
1-that iam writing in english
2-that iam too late (exams
(
1-that iam writing in english
2-that iam too late (exams
(
and this is my project i hope you like it 
i made it on powerpoint
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chemicalh.rar (1.23 ميجابايت, 3163 مشاهدات)