Prüfergebnis. Chemieunterricht in der Schule. Reagenzgläser mit bunten Substanzen. Schullabor. Schüler der Gemeinschaftsschule untersuchen chemische Flüssigkeiten. Schülerinnen und Schüler führen Schulversuch mit Flüssigkeiten durch. - Stockfoto & -bild

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