Έξυπνοι μαθητές κοριτσιών και αγοριών διεξάγουν σχολικά πειράματα. Σχολική εκπαίδευση. Χημική ανάλυση. Τα παιδιά μελετούν χημεία. Μάθημα χημείας. Εργαστήριο σχολείου. Περιγράψτε το σημειωματάριο χημικής αντίδρασης. - Φωτογραφίες & Εικόνες Αρχείου

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