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ទាញយកឯកសារទាក់ទងនឹងវគ្គទី២នៃវគ្គបណ្តុះបណ្តាលស្តីពីបចេ្ចកវិទ្យាខ្នាតធំពីនេះ៖ https://drive.google.com/drive/folders/1VdOHQsj5xN2Ru9tN14NDfETvXWUQG0Iv?usp=sharing
