ចូរប្អូនធ្វើតេស្តរង្វាយតម្លៃសមត្ថភាពយល់ដឹងលើមេរៀនសញ្ញាណទូទៅនៃការស្រាវជ្រាវអប់រំ។
Grading method: Highest grade
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