តើទំហំនៃកម្រិតវិមជ្ឈការរបស់ក្រុមប្រឹក្សាឃុំ-សង្កាត់មានអ្វីខ្លះ? តើវិមជ្ឈការឃុំ-សង្កាត់មានអំណាចលើវស័យអ្វីខ្លះ?

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