Hellow guys, Welcome to my website, and you are watching 108新課綱｜八上理化｜【觀念】聲音的頻率和音調. and this vIdeo is uploaded by 臺北酷課雲 at 2019-11-06T18:23:20-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.