herman yeung - hkdse chem chapter 0-3 (miscellaneous 雜項) - warning label & lab safety 警告標籤 和 實驗室安全 Published 5 years ago • 13K plays • Length 10:34 Download video MP4 Download video MP3 Similar videos 8:52 herman yeung - hkdse chemistry chapter 07 10:13 [dse] 化學博士同場!chem點讀可以輕鬆高分?補底捷徑?重點課題有邊啲?有咩錯誤唔可以犯?要寫筆記嗎?5**化學博士x醫科生分享!(ft. 化學博士davy)|angel the medic 13:29 hkdse 化學科課程講解 ch.8 共價鍵 3:49 dse化學科心得