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2020-08-12 20:19
Question តើហេតុអ្វីបានជាពន្លឺដាលក្នុងបរិយាកាសឬខ្យល់បានលឿនជាងមឈ្ឈដ្ឋានដទៃ? បើពន្លឺដាលក្នុងខ្យល់មានតម្លៃប្រហែល 300.100000m/s ។
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