亚洲情色基地

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                先河↑文教用品廠小①學科學用具視頻教學地址(14種視頻)


                發布時間:2012-1-3  來源:先河在此刻文教用品廠 分享道

                14種視頻
                (1)溶解過濾

                (2)種子發芽

                (3)指南針 磁懸浮

                (4)水輪車

                (5)小孔成像 照相機成像

                (6)滑輪 測力器

                (7)平面鏡 光

                (8)摩擦力 輪子省力

                (9)紅綠燈

                (10)杠桿 天平

                (11)風力風向

                (12)齒輪 皮帶輪 轆轤

                (13)電路

                (14)電磁鐵