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作图法解释凸透镜成像原理2068abbbc727a66deb62b1d72c96bb18.mp4 Loading commit data...
做一回小小伽利略9bf25a11c11f14d3a30f7772b7b144bc.mp4 Loading commit data...
变音的吸管a553890bb695b7f2c30cccb4b3cc63af.mp4 Loading commit data...
吹灭蜡烛的扬声器55354fa377f73fa812cf992e50078352.mp4 Loading commit data...
响度2ee9f9bb530c1068250d2110d1e58650.mp4 Loading commit data...
学生实验：探究凸透镜成像规律1be3f0c67d962a5e807cb0490fe2bdc3.mp4 Loading commit data...
学生实验：探究平面镜成像的特点453f4c63f8e53eb42f69cd3f00de22bd.mp4 Loading commit data...
学生实验：用DIS探究二力平衡的条件9124f1d908bf76c8052a2506f29798bb.mp4 Loading commit data...
学生实验：用弹簧测力计测力055c6d83394dd665cbe0abf56ad342bf.mp4 Loading commit data...
悬挂法找物体的重心位置25243b40e6e5865954e3f9261b88d826.mp4 Loading commit data...
探究光的反射定律a2fae008539409d3a5549f52c01202a6.mp4 Loading commit data...
注水现币aa790f177214b2b274340d799a7a48a2.mp4 Loading commit data...
测量速度的方法bf71b6a26d177235b4563d970fec153a.pdf Loading commit data...
物体一定要接触才能产生力的作用吗f0a8636fe52d5495aff65ef3590255d5.mp4 Loading commit data...
特殊测量的方法bc9818a086df94348cba04bd3b55da9d.mp4 Loading commit data...
玻璃和水对光的折射本领比较2e86d453b7fb8c8b4d45f95ee6ba354b.mp4 Loading commit data...
盛水烧瓶成像10f61ddba0351d6c22581484b1f76289.mp4 Loading commit data...
相互作用力的特点aba8de658df50000900d3f72e73a39ff.mp4 Loading commit data...
空中加油b6a5734d5a0f4fb65678e3a0e21cb1fc.mp4 Loading commit data...
简易潜望镜的工作原理7f7b416212391c5f9300d41c682c418f.mp4 Loading commit data...
运动的世界9153249866804d34fa952bca9ae0a592.mp4 Loading commit data...
运动的小火车74a180c914fe541e3927f8e7a77aeef9.mp4 Loading commit data...
近取诸身——我国古代部分长度单位探源7d4daf9d8fba585a52540b7828cc4eb7.pdf Loading commit data...
透镜及其概念1c64dec6af2a2f97f548a4b08179ee81.mp4 Loading commit data...
重力G和质量m的比值g与物体的材料有关吗4957b862456e8a3445006b575fb44406.mp4 Loading commit data...
重力的方向02097ece204bb0f986a01a72dcbb152d.mp4 Loading commit data...
音色的内涵b9c636f43120ea922d949e789979e21d.mp4 Loading commit data...
音调与频率83bc481df4a4f13604fe867afa53bbdb.mp4 Loading commit data...