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උසස් පෙළ රසායන විද්යාව ප්රායෝගික අත්පොත https://scitechlk.com/product/%e0%b6%8b%e0%b7%83%e0%b7%83%e0%b7%8a-%e0%b6%b4%e0%b7%99%e0%b7%85-%e0%b6%bb%e0%b7%83%e0%b7%8f%e0%b6%ba%e0%b6%b1-%e0%b7%80%e0%b7%92%e0%b6%af%e0%b7%8a%e2%80%8d%e0%b6%ba%e0%b7%8f%e0%b7%80-%e0%b6%b4/