ile:05温度、热传递和分子动理论.mp4 file:14浮力.mp4 file:13液体压强和大气压强.mp4 file:04透镜及其应用.mp4 file:22安全用电.mp4 file:15机械效率公式选择.mp4 file:20照顾最小原则.mp4 file:01力和运动图象题.mp4 file:17电路故障分析.mp4 file:08杠杆中力的变化.mp4 file:06有台秤读数的浮力问题.mp4 file:11变化量思想解杠杆题.mp4 file:06设计实验.mp4 file:10响度音调音色的辨析.mp4 file:03不同物体的传声效果不同.mp4 file:05关于声速的综合计算.mp4 file:02声音的传播需要介质.mp4 file:01声音是由物体振动产生的.mp4 file:12噪声的定义及防治.mp4 file:12电功率的动态变化.mp4 file:09额定功率与实际功率.mp4 file:22焦耳定律实验的应用.mp4 file:19单伏法测量灯泡电功率.mp4 file:03电功的物理意义、单位及公式.mp4 file:05常见用电器的功率.mp4 file:25用电器电路焦耳定律的计算.mp4