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Watch Later 2:19

Watch Later 3:35

Transverse wave 2

Watch Later 1:21

Watch Later 12:35

DSE_V_Ch 4 and 5 物品與分工

Watch Later 1:27

S4_化學_CH8_C1_結構式和分子式

Watch Later 11:00

DSE_V_Ch 4 and 5_生產要素

Watch Later 1:41

S4_化學_CH8_C2_單鍵、雙鍵和三鍵

Watch Later 4:28

Transverse wave 3

Watch Later 2:26

S4_化學_CH8_B1_共價分子的電子圖

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