30 -- 5:16 App 003 DK super simple physics : energy stores 2488 1 3:27 App ALevel物理|波|纵波与横波 (A-Level Physics | Wave | Longitudinal and transverse wave) 75 -- 3:24 App GCSE physics: conservation of energy 62 -- 23:35 App IG/GCSE物理paper2选择题多选题精讲01 168 --...