Physics Grade12 Chapter02 Lesson01: Principles of Sheriff and Standing Waves (Part1) ebc 188 ចំនួនមើល • 2 ឆ្នាំកន្លងទៅ
Physics Grade12 Chapter02 Lesson01: Principles of Sheriff and Standing Waves (Part2) ebc 129 ចំនួនមើល • 2 ឆ្នាំកន្លងទៅ
