| ![]()  | 01.1【知识点】长度和时间的测量(2022-06-24 17-47-14).mp4 | 2025-07-26 20:01:13 | 65.08 MB |  | 
                        
                                | ![]()  | 01.2【练习题】长度和时间的测量(2022-06-24 17-43-22).mp4 | 2025-07-26 20:01:16 | 40.67 MB |  | 
                        
                                | ![]()  | 02.1【知识点】运动的描述(2022-06-24 17-47-15).mp4 | 2025-07-26 20:01:09 | 25.42 MB |  | 
                        
                                | ![]()  | 02.2【练习题】运动的描述(2022-06-24 17-43-24).mp4 | 2025-07-26 20:01:12 | 45.51 MB |  | 
                        
                                | ![]()  | 03.1【知识点】运动的快慢(2022-06-24 17-47-17).mp4 | 2025-07-26 20:01:13 | 34.45 MB |  | 
                        
                                | ![]()  | 03.2【练习题】运动的快慢(2022-06-24 17-43-25).mp4 | 2025-07-26 20:01:18 | 60.7 MB |  | 
                        
                                | ![]()  | 04.1【知识点】变速运动与平均速度(2022-06-24 17-47-19).mp4 | 2025-07-26 20:01:19 | 35.46 MB |  | 
                        
                                | ![]()  | 04.2【练习题】变速运动与平均速度(2022-06-24 17-43-27).mp4 | 2025-07-26 20:01:11 | 69.62 MB |  | 
                        
                                | ![]()  | 05.1【知识点】声音的产生和传播(2022-06-24 17-47-21).mp4 | 2025-07-26 20:01:11 | 57.22 MB |  | 
                        
                                | ![]()  | 05.2【练习题】声音的产生和传播(2022-06-24 17-43-28).mp4 | 2025-07-26 20:01:17 | 42.17 MB |  | 
                        
                                | ![]()  | 06.1【知识点】声音的特性(2022-06-24 17-47-22).mp4 | 2025-07-26 20:01:12 | 25.57 MB |  | 
                        
                                | ![]()  | 06.2【练习题】声音的特性(2022-06-24 17-43-29).mp4 | 2025-07-26 20:01:18 | 121.43 MB |  | 
                        
                                | ![]()  | 07.1【知识点】声音的利用(2022-06-24 17-47-23).mp4 | 2025-07-26 20:01:17 | 24.55 MB |  | 
                        
                                | ![]()  | 07.2【练习题】声音的利用(2022-06-24 17-43-31).mp4 | 2025-07-26 20:01:19 | 68.44 MB |  | 
                        
                                | ![]()  | 08.1【知识点】噪声的危害与控制(2022-06-24 17-47-25).mp4 | 2025-07-26 20:01:17 | 22.3 MB |  | 
                        
                                | ![]()  | 08.2【练习题】噪声的危害与控制(2022-06-24 17-43-32).mp4 | 2025-07-26 20:01:10 | 58.93 MB |  | 
                        
                                | ![]()  | 09.1【知识点】温度(2022-06-24 17-47-26).mp4 | 2025-07-26 20:01:18 | 64.75 MB |  | 
                        
                                | ![]()  | 09.2【练习题】温度(2022-06-24 17-43-33).mp4 | 2025-07-26 20:01:12 | 76.45 MB |  | 
                        
                                | ![]()  | 10.1【知识点】熔化和凝固(2022-06-24 17-47-27).mp4 | 2025-07-26 20:01:09 | 32.08 MB |  | 
                        
                                | ![]()  | 10.2【练习题】熔化和凝固(2022-06-24 17-43-35).mp4 | 2025-07-26 20:01:19 | 53.15 MB |  | 
                        
                                | ![]()  | 11.1【知识点】液化和汽化(2022-06-24 17-47-29).mp4 | 2025-07-26 20:01:15 | 46.06 MB |  | 
                        
                                | ![]()  | 11.2【练习题】液化和汽化(2022-06-24 17-43-36).mp4 | 2025-07-26 20:01:13 | 58.79 MB |  | 
                        
                                | ![]()  | 12.1【知识点】升华和凝华(2022-06-24 17-47-30).mp4 | 2025-07-26 20:01:12 | 29.86 MB |  | 
                        
                                | ![]()  | 12.2【练习题】升华和凝华(2022-06-24 17-43-37).mp4 | 2025-07-26 20:01:10 | 58.96 MB |  | 
                        
                                | ![]()  | 13.1【知识点】光沿直线传播(2022-06-24 17-47-31).mp4 | 2025-07-26 20:01:11 | 48.1 MB |  | 
                        
                                | ![]()  | 13.2【练习题】光沿直线传播(2022-06-24 17-43-38).mp4 | 2025-07-26 20:01:09 | 42.62 MB |  | 
                        
                                | ![]()  | 14.1【知识点】光的反射(2022-06-24 17-47-32).mp4 | 2025-07-26 20:01:16 | 27.61 MB |  | 
                        
                                | ![]()  | 14.2【练习题】光的反射(2022-06-24 17-43-40).mp4 | 2025-07-26 20:01:16 | 45.27 MB |  | 
                        
                                | ![]()  | 15.1【知识点】平面镜成像(2022-06-24 17-47-34).mp4 | 2025-07-26 20:01:17 | 17.22 MB |  | 
                        
                                | ![]()  | 15.2【练习题】平面镜成像(2022-06-24 17-43-41).mp4 | 2025-07-26 20:01:19 | 47.71 MB |  | 
                        
                                | ![]()  | 16.1【知识点】光的折射(2022-06-24 17-47-35).mp4 | 2025-07-25 11:07:49 | 17.13 MB |  | 
                        
                                | ![]()  | 16.2【练习题】光的折射(2022-06-24 17-43-43).mp4 | 2025-07-25 11:07:49 | 43.18 MB |  | 
                        
                                | ![]()  | 17.1【知识点】光的色散(2022-06-24 17-47-36).mp4 | 2025-07-25 11:07:49 | 36.44 MB |  | 
                        
                                | ![]()  | 17.2【练习题】光的色散(2022-06-24 17-43-44).mp4 | 2025-07-25 11:07:48 | 39.82 MB |  | 
                        
                                | ![]()  | 18.1【知识点】透镜(2022-06-24 17-47-38).mp4 | 2025-07-25 11:07:48 | 30.72 MB |  | 
                        
                                | ![]()  | 18.2【练习题】透镜(2022-06-24 17-43-45).mp4 | 2025-07-25 11:07:48 | 30.01 MB |  | 
                        
                                | ![]()  | 19.1【知识点】生活中的透镜及凸透镜成像规律(2022-06-24 17-47-39).mp4 | 2025-07-25 11:07:48 | 40.28 MB |  | 
                        
                                | ![]()  | 19.2【练习题】生活中的透镜及凸透镜成像规律(2022-06-24 17-43-46).mp4 | 2025-07-25 11:07:46 | 78.35 MB |  | 
                        
                                | ![]()  | 20.1【知识点】眼睛和眼镜(2022-06-24 17-47-40).mp4 | 2025-07-25 11:07:46 | 31.12 MB |  | 
                        
                                | ![]()  | 20.2【练习题】眼睛和眼镜(2022-06-24 17-43-48).mp4 | 2025-07-25 11:07:45 | 69.86 MB |  | 
                        
                                | ![]()  | 21.1【知识点】显微镜和望远镜(2022-06-24 17-47-41).mp4 | 2025-07-25 11:07:45 | 30.67 MB |  | 
                        
                                | ![]()  | 21.2【练习题】显微镜和望远镜(2022-06-24 17-43-49).mp4 | 2025-07-25 11:07:45 | 58.85 MB |  | 
                        
                                | ![]()  | 22.1【知识点】质量(2022-06-24 17-47-43).mp4 | 2025-07-25 11:07:45 | 36.88 MB |  | 
                        
                                | ![]()  | 22.2【练习题】质量(2022-06-24 17-43-51).mp4 | 2025-07-25 11:07:45 | 64.4 MB |  | 
                        
                                | ![]()  | 23.1【知识点】密度(2022-06-24 17-47-44).mp4 | 2025-07-25 11:07:44 | 29.49 MB |  | 
                        
                                | ![]()  | 23.2【练习题】密度(2022-06-24 17-43-52).mp4 | 2025-07-25 11:07:44 | 75.52 MB |  | 
                        
                                | ![]()  | 24.1【知识点】测量物质的密度(2022-06-24 17-47-45).mp4 | 2025-07-25 11:07:44 | 44.03 MB |  | 
                        
                                | ![]()  | 24.2【练习题】测量物质的密度(2022-06-24 17-43-53).mp4 | 2025-07-25 11:07:44 | 88.05 MB |  | 
                        
                                | ![]()  | 25.1【知识点】密度与社会生活(2022-06-24 17-49-22).mp4 | 2025-07-25 11:07:43 | 31.47 MB |  | 
                        
                                | ![]()  | 25.2【练习题】密度与社会生活(2022-06-24 17-43-55).mp4 | 2025-07-25 11:07:43 | 52.54 MB |  | 
                        
                                | ![]()  | 26.1【知识点】力(2022-06-24 17-49-23).mp4 | 2025-07-25 11:07:42 | 53.98 MB |  | 
                        
                                | ![]()  | 26.2【练习题】力(2022-06-24 17-43-56).mp4 | 2025-07-25 11:07:42 | 42.61 MB |  | 
                        
                                | ![]()  | 27.1【知识点】弹力(2022-06-24 17-49-24).mp4 | 2025-07-25 11:07:42 | 30.58 MB |  | 
                        
                                | ![]()  | 27.2【练习题】弹力(2022-06-24 17-43-57).mp4 | 2025-07-25 11:07:41 | 67.68 MB |  | 
                        
                                | ![]()  | 28.1【知识点】重力(2022-06-24 17-49-26).mp4 | 2025-07-25 11:07:41 | 34.07 MB |  | 
                        
                                | ![]()  | 28.2【练习题】重力(2022-06-24 17-43-58).mp4 | 2025-07-25 11:07:40 | 47.25 MB |  | 
                        
                                | ![]()  | 29.1【知识点】牛顿第一定律(2022-06-24 17-49-27).mp4 | 2025-07-25 11:07:40 | 35.13 MB |  | 
                        
                                | ![]()  | 29.2【练习题】牛顿第一定律(2022-06-24 17-44-00).mp4 | 2025-07-25 11:07:38 | 42.42 MB |  | 
                        
                                | ![]()  | 30.1【知识点】二力平衡(2022-06-24 17-49-28).mp4 | 2025-07-25 11:07:38 | 30.27 MB |  | 
                        
                                | ![]()  | 30.2【练习题】二力平衡(2022-06-24 17-44-01).mp4 | 2025-07-25 11:07:38 | 65.56 MB |  | 
                        
                                | ![]()  | 31.1【知识点】摩擦力(2022-06-24 17-49-30).mp4 | 2025-07-25 11:07:38 | 44.96 MB |  | 
                        
                                | ![]()  | 31.2【练习题】摩擦力(2022-06-24 17-44-03).mp4 | 2025-07-25 11:07:38 | 75.08 MB |  | 
                        
                                | ![]()  | 32.1【知识点】压强(2022-06-24 17-49-31).mp4 | 2025-07-25 11:07:38 | 24.25 MB |  | 
                        
                                | ![]()  | 32.2【练习题】压强(2022-06-24 17-44-04).mp4 | 2025-07-25 11:07:37 | 61.37 MB |  | 
                        
                                | ![]()  | 33.1【知识点】液体的压强(2022-06-24 17-49-32).mp4 | 2025-07-25 11:07:37 | 20.69 MB |  | 
                        
                                | ![]()  | 33.2【练习题】液体的压强(2022-06-24 17-44-05).mp4 | 2025-07-25 11:07:37 | 72.56 MB |  | 
                        
                                | ![]()  | 34.1【知识点】大气压强(2022-06-24 17-49-34).mp4 | 2025-07-25 11:07:37 | 35.02 MB |  | 
                        
                                | ![]()  | 34.2【练习题】大气压强(2022-06-24 17-44-07).mp4 | 2025-07-25 11:07:36 | 60.59 MB |  | 
                        
                                | ![]()  | 35.1【知识点】流体压强与流速的关系(2022-06-24 17-49-35).mp4 | 2025-07-25 11:07:36 | 13.4 MB |  | 
                        
                                | ![]()  | 35.2【练习题】流体压强与流速的关系(2022-06-24 17-44-08).mp4 | 2025-07-25 11:07:36 | 70.06 MB |  | 
                        
                                | ![]()  | 36.1【知识点】浮力和阿基米德原理(2022-06-24 17-49-36).mp4 | 2025-07-25 11:07:36 | 31.86 MB |  | 
                        
                                | ![]()  | 36.2【练习题】浮力和阿基米德原理(2022-06-24 17-44-09).mp4 | 2025-07-25 11:07:35 | 88.02 MB |  | 
                        
                                | ![]()  | 37.1【知识点】物体的浮沉条件及应用(2022-06-24 17-49-38).mp4 | 2025-07-25 11:07:35 | 16.64 MB |  | 
                        
                                | ![]()  | 37.2【练习题】物体的浮沉条件及应用(2022-06-24 17-44-10).mp4 | 2025-07-25 11:07:35 | 81.04 MB |  | 
                        
                                | ![]()  | 38.1【知识点】功(2022-06-24 17-49-39).mp4 | 2025-07-25 11:07:35 | 19.82 MB |  | 
                        
                                | ![]()  | 38.2【练习题】功(2022-06-24 17-44-12).mp4 | 2025-07-25 11:07:35 | 50.94 MB |  | 
                        
                                | ![]()  | 39.1【知识点】功率(2022-06-24 17-49-40).mp4 | 2025-07-25 11:07:34 | 20.15 MB |  | 
                        
                                | ![]()  | 39.2【练习题】功率(2022-06-24 17-44-13).mp4 | 2025-07-25 11:07:33 | 58.14 MB |  | 
                        
                                | ![]()  | 40.1【知识点】动能和势能(2022-06-24 17-49-41).mp4 | 2025-07-25 11:07:32 | 29.53 MB |  | 
                        
                                | ![]()  | 40.2【练习题】动能和势能(2022-06-24 17-44-14).mp4 | 2025-07-25 11:07:32 | 60.58 MB |  | 
                        
                                | ![]()  | 41.1【知识点】机械能及其转化(2022-06-24 17-49-43).mp4 | 2025-07-25 11:07:32 | 14.95 MB |  | 
                        
                                | ![]()  | 41.2【练习题】机械能及其转化(2022-06-24 17-44-16).mp4 | 2025-07-25 11:07:32 | 65.98 MB |  | 
                        
                                | ![]()  | 42.1【知识点】杠杆(2022-06-24 17-49-44).mp4 | 2025-07-25 11:07:32 | 41.06 MB |  | 
                        
                                | ![]()  | 42.2【练习题】杠杆(2022-06-24 17-44-17).mp4 | 2025-07-25 11:07:32 | 61.64 MB |  | 
                        
                                | ![]()  | 43.1【知识点】滑轮(2022-06-24 17-49-45).mp4 | 2025-07-25 11:07:31 | 59.08 MB |  | 
                        
                                | ![]()  | 43.2【练习题】滑轮(2022-06-24 17-44-19).mp4 | 2025-07-25 11:07:31 | 70.43 MB |  | 
                        
                                | ![]()  | 44.1【知识点】机械效率(2022-06-24 17-49-47).mp4 | 2025-07-25 11:07:31 | 18.48 MB |  | 
                        
                                | ![]()  | 44.2【练习题】机械效率(2022-06-24 17-44-20).mp4 | 2025-07-25 11:07:31 | 95.74 MB |  | 
                        
                                | ![]()  | 45.1【知识点】分子热运动(2022-06-24 17-49-48).mp4 | 2025-07-25 11:07:31 | 35.07 MB |  | 
                        
                                | ![]()  | 45.2【练习题】分子热运动(2022-06-24 17-44-22).mp4 | 2025-07-25 11:07:30 | 65.19 MB |  | 
                        
                                | ![]()  | 46.1【知识点】内能(2022-06-24 17-49-49).mp4 | 2025-07-25 11:07:30 | 28.64 MB |  | 
                        
                                | ![]()  | 46.2【练习题】内能(2022-06-24 17-44-23).mp4 | 2025-07-25 11:07:30 | 35.79 MB |  | 
                        
                                | ![]()  | 47.1【知识点】比热容(2022-06-24 17-49-50).mp4 | 2025-07-25 11:07:30 | 42.39 MB |  | 
                        
                                | ![]()  | 47.2【练习题】比热容(2022-06-24 17-44-24).mp4 | 2025-07-25 11:07:30 | 68.86 MB |  | 
                        
                                | ![]()  | 48.1【知识点】热机的效率(2022-06-24 17-49-52).mp4 | 2025-07-25 11:07:29 | 126.25 MB |  | 
                        
                                | ![]()  | 48.2【练习题】热机的效率(2022-06-24 17-44-25).mp4 | 2025-07-25 11:07:29 | 62.91 MB |  | 
                        
                                | ![]()  | 49.1【知识点】能量的转化和守恒(2022-06-24 17-49-53).mp4 | 2025-07-25 11:07:29 | 24.32 MB |  | 
                        
                                | ![]()  | 49.2【练习题】能量的转化和守恒(2022-06-24 17-44-27).mp4 | 2025-07-25 11:07:27 | 43.53 MB |  | 
                        
                                | ![]()  | 50.1【知识点】两种电荷(2022-06-24 17-49-55).mp4 | 2025-07-25 11:07:27 | 59.62 MB |  | 
                        
                                | ![]()  | 50.2【练习题】两种电荷(2022-06-24 17-44-28).mp4 | 2025-07-25 11:07:27 | 49.78 MB |  | 
                        
                                | ![]()  | 51.1【知识点】电流和电路(2022-06-24 17-49-56).mp4 | 2025-07-25 11:07:26 | 51.63 MB |  | 
                        
                                | ![]()  | 51.2【练习题】电流和电路(2022-06-24 17-46-38).mp4 | 2025-07-25 11:07:26 | 60.28 MB |  | 
                        
                                | ![]()  | 52.1【知识点】串联和并联(2022-06-24 17-49-57).mp4 | 2025-07-25 11:07:25 | 30.35 MB |  | 
                        
                                | ![]()  | 52.2【练习题】串联和并联(2022-06-24 17-46-40).mp4 | 2025-07-25 11:07:24 | 55.1 MB |  | 
                        
                                | ![]()  | 53.1【知识点】电流的测量(2022-06-24 17-49-58).mp4 | 2025-07-25 11:07:24 | 27.44 MB |  | 
                        
                                | ![]()  | 53.2【练习题】电流的测量(2022-06-24 17-46-41).mp4 | 2025-07-25 11:07:24 | 31.96 MB |  | 
                        
                                | ![]()  | 54.1【知识点】串、并联电路的电流规律(2022-06-24 17-50-00).mp4 | 2025-07-25 11:07:24 | 12.01 MB |  | 
                        
                                | ![]()  | 54.2【练习题】串、并联电路的电流规律(2022-06-24 17-46-42).mp4 | 2025-07-25 11:07:24 | 52.62 MB |  | 
                        
                                | ![]()  | 55.1【知识点】电压(2022-06-24 17-50-01).mp4 | 2025-07-25 11:07:24 | 27.31 MB |  | 
                        
                                | ![]()  | 55.2【练习题】电压(2022-06-24 17-46-44).mp4 | 2025-07-25 11:07:23 | 45.95 MB |  | 
                        
                                | ![]()  | 56.1【知识点】串、并联电路的电压规律(2022-06-24 17-47-13).mp4 | 2025-07-25 11:07:23 | 13.66 MB |  | 
                        
                                | ![]()  | 56.2【练习题】串、并联电路的电压规律(2022-06-24 17-46-45).mp4 | 2025-07-25 11:07:23 | 48.76 MB |  | 
                        
                                | ![]()  | 57.1【知识点】电阻(2022-06-24 17-50-03).mp4 | 2025-07-25 11:07:23 | 38.67 MB |  | 
                        
                                | ![]()  | 57.2【练习题】电阻(2022-06-24 17-46-47).mp4 | 2025-07-25 11:07:22 | 44.34 MB |  | 
                        
                                | ![]()  | 58.1【知识点】变阻器(2022-06-24 17-50-04).mp4 | 2025-07-25 11:07:22 | 28.67 MB |  | 
                        
                                | ![]()  | 58.2【练习题】变阻器(2022-06-24 17-46-48).mp4 | 2025-07-25 11:07:22 | 44.54 MB |  | 
                        
                                | ![]()  | 59.1【知识点】欧姆定律及实验探究(2022-06-24 17-50-05).mp4 | 2025-07-25 11:07:22 | 23.16 MB |  | 
                        
                                | ![]()  | 59.2【练习题】欧姆定律及实验探究(2022-06-24 17-46-49).mp4 | 2025-07-25 11:07:20 | 83.15 MB |  | 
                        
                                | ![]()  | 60.1【知识点】欧姆定律的应用及电阻的测量(2022-06-24 17-50-07).mp4 | 2025-07-25 11:07:20 | 42.23 MB |  | 
                        
                                | ![]()  | 60.2【练习题】欧姆定律的应用及电阻的测量(2022-06-24 17-46-51).mp4 | 2025-07-25 11:07:19 | 60.58 MB |  | 
                        
                                | ![]()  | 61.1【知识点】电能和电功(2022-06-24 17-50-08).mp4 | 2025-07-25 11:07:19 | 24.78 MB |  | 
                        
                                | ![]()  | 61.2【练习题】电能和电功(2022-06-24 17-46-52).mp4 | 2025-07-25 11:07:19 | 61.12 MB |  | 
                        
                                | ![]()  | 62.1【知识点】电功率及其实验探究(2022-06-24 17-50-09).mp4 | 2025-07-25 11:07:19 | 28.98 MB |  | 
                        
                                | ![]()  | 62.2【练习题】电功率及其实验探究(2022-06-24 17-46-53).mp4 | 2025-07-25 11:07:18 | 76.77 MB |  | 
                        
                                | ![]()  | 63.1【知识点】焦耳定律(2022-06-24 17-50-10).mp4 | 2025-07-25 11:07:18 | 24.78 MB |  | 
                        
                                | ![]()  | 63.2【练习题】焦耳定律(2022-06-24 17-46-55).mp4 | 2025-07-25 11:07:18 | 71.68 MB |  | 
                        
                                | ![]()  | 64.1【知识点】家庭电路(2022-06-24 17-50-12).mp4 | 2025-07-25 11:07:18 | 25.67 MB |  | 
                        
                                | ![]()  | 64.2【练习题】家庭电路(2022-06-24 17-46-56).mp4 | 2025-07-25 11:07:18 | 50.08 MB |  | 
                        
                                | ![]()  | 65.1【知识点】家庭电路电流过大的原因及安全用电(2022-06-24 17-50-13).mp4 | 2025-07-25 11:07:17 | 10.02 MB |  | 
                        
                                | ![]()  | 65.2【练习题】家庭电路电流过大的原因及安全用电(2022-06-24 17-46-57).mp4 | 2025-07-25 11:07:17 | 51.06 MB |  | 
                        
                                | ![]()  | 66.1【知识点】磁现象、磁场(2022-06-24 17-50-15).mp4 | 2025-07-25 11:07:17 | 69.3 MB |  | 
                        
                                | ![]()  | 66.2【练习题】磁现象、磁场(2022-06-24 17-46-59).mp4 | 2025-07-25 11:07:17 | 52.01 MB |  | 
                        
                                | ![]()  | 67.1【知识点】电生磁(2022-06-24 17-50-16).mp4 | 2025-07-25 11:07:17 | 19 MB |  | 
                        
                                | ![]()  | 67.2【练习题】电生磁(2022-06-24 17-47-00).mp4 | 2025-07-25 11:07:16 | 48.05 MB |  | 
                        
                                | ![]()  | 68.1【知识点】电磁铁及电磁继电器(2022-06-24 17-50-17).mp4 | 2025-07-25 11:07:16 | 25.75 MB |  | 
                        
                                | ![]()  | 68.2【练习题】电磁铁及电磁继电器(2022-06-24 17-47-01).mp4 | 2025-07-25 11:07:16 | 46.63 MB |  | 
                        
                                | ![]()  | 69.1【知识点】电动机(2022-06-24 17-50-19).mp4 | 2025-07-25 11:07:16 | 70.66 MB |  | 
                        
                                | ![]()  | 69.2【练习题】电动机(2022-06-24 17-47-03).mp4 | 2025-07-25 11:07:14 | 56.48 MB |  | 
                        
                                | ![]()  | 70.1【知识点】磁生电(2022-06-24 17-50-20).mp4 | 2025-07-25 11:07:14 | 39.08 MB |  | 
                        
                                | ![]()  | 70.2【练习题】磁生电(2022-06-24 17-47-04).mp4 | 2025-07-25 11:07:14 | 47.32 MB |  | 
                        
                                | ![]()  | 71.1【知识点】电话、电磁波的海洋(2022-06-24 17-50-21).mp4 | 2025-07-25 11:07:13 | 27.14 MB |  | 
                        
                                | ![]()  | 71.2【练习题】电话、电磁波的海洋(2022-06-24 17-47-06).mp4 | 2025-07-25 11:07:13 | 43.78 MB |  | 
                        
                                | ![]()  | 72.1【知识点】广播,电视,移动通信(2022-06-24 17-50-23).mp4 | 2025-07-25 11:07:13 | 18.53 MB |  | 
                        
                                | ![]()  | 72.2【练习题】广播,电视,移动通信(2022-06-24 17-47-07).mp4 | 2025-07-25 11:07:13 | 41.23 MB |  | 
                        
                                | ![]()  | 73.1【知识点】越来越宽的信息之路(2022-06-24 17-50-24).mp4 | 2025-07-25 11:07:12 | 13.3 MB |  | 
                        
                                | ![]()  | 73.2【练习题】越来越宽的信息之路(2022-06-24 17-47-08).mp4 | 2025-07-25 11:07:12 | 26.77 MB |  | 
                        
                                | ![]()  | 74.1【知识点】能源与核能(2022-06-24 17-50-25).mp4 | 2025-07-25 11:07:12 | 22.58 MB |  | 
                        
                                | ![]()  | 74.2【练习题】能源与核能(2022-06-24 17-47-10).mp4 | 2025-07-25 11:07:12 | 41.92 MB |  | 
                        
                                | ![]()  | 75.1【知识点】太阳能、能源与可持续发展(2022-06-24 17-50-27).mp4 | 2025-07-25 11:07:12 | 18.56 MB |  | 
                        
                                | ![]()  | 75.2【练习题】太阳能、能源与可持续发展(2022-06-24 17-47-11).mp4 | 2025-07-25 11:07:11 | 33 MB |  |