文理書院(香港)__新高中物理: 運動學 P.21 Ex 21 http://www.youtube.com/watch?v=lXlfQqFk9xc … @minitubeappさんから #highschool #physics #cantonese
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文理書院(香港)__新高中物理: 運動學 P.21 Ex 21 http://www.youtube.com/watch?v=lXlfQqFk9xc … @minitubeappさんから #highschool #physics #cantonese