載入中... 相關課程 Back 6-1觀念01波的種類-依需要介質與否區分 登入觀看 ⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles. 6-1觀念01波的種類-依需要介質與否區分 上傳學習單 下載學習單