| 自行车行驶 |
2007-6-17 8:15:07 |
0 K |
210 |
★★★ |
| 自行车行驶 |
2007-6-17 8:14:44 |
0 K |
147 |
★★★ |
| 整齐的队伍 |
2007-6-17 8:14:03 |
0 K |
42 |
★★★ |
| 同步卫星 |
2007-6-17 8:12:20 |
0 K |
79 |
★★★ |
| 跳伞运动 |
2007-6-17 8:11:59 |
0 K |
47 |
★★★ |
| 千山缆车运动 |
2007-6-17 8:11:33 |
0 K |
43 |
★★★ |
| 汽车速度计 |
2007-6-17 8:11:12 |
0 K |
83 |
★★★ |
| 汽车驶过 |
2007-6-17 8:10:50 |
0 K |
48 |
★★★ |
| 汽车 |
2007-6-17 8:10:29 |
0 K |
26 |
★★★ |
| 联合收割机 |
2007-6-17 8:08:56 |
0 K |
60 |
★★★ |
| 交警用的测速器 |
2007-6-17 8:08:31 |
0 K |
139 |
★★★ |
| 交警用的测速器 |
2007-6-17 8:08:09 |
0 K |
20 |
★★★ |
| 火箭的升空 |
2007-6-17 8:07:25 |
0 K |
57 |
★★★ |
| 过山车 |
2007-6-17 8:07:02 |
0 K |
69 |
★★★ |
| 飞机编队 |
2007-6-17 8:06:40 |
0 K |
48 |
★★★ |
| 大炮射击 |
2007-6-17 8:06:14 |
0 K |
29 |
★★★ |
| 磁悬浮列车 |
2007-6-17 8:05:44 |
0 K |
164 |
★★★ |
| 参照物 |
2007-6-17 8:04:57 |
0 K |
53 |
★★★ |
| 总功率过大 |
2007-6-17 8:04:35 |
0 K |
80 |
★★★ |
| 紫外线的应用 |
2007-6-17 8:03:47 |
0 K |
44 |
★★★ |
| 直线电流的磁场 |
2007-6-17 8:02:56 |
0 K |
83 |
★★★ |
| 直流与交流 |
2007-6-17 8:02:34 |
0 K |
467 |
★★★ |
| 直流电动机 |
2007-6-17 8:01:51 |
0 K |
389 |
★★★ |
| 蒸发吸热的应用 |
2007-6-17 8:01:29 |
0 K |
31 |
★★★ |
| 真空中的闹钟 |
2007-6-17 8:01:06 |
0 K |
49 |
★★★ |
| 真空中的闹钟 |
2007-6-17 8:00:43 |
0 K |
52 |
★★★ |
| 照相机原理 |
2007-6-17 8:00:19 |
0 K |
54 |
★★★ |
| 噪音 |
2007-6-17 7:59:35 |
0 K |
36 |
★★★ |
| 圜丘喊话 |
2007-6-17 7:58:29 |
0 K |
35 |
★★★ |
| 圜丘 |
2007-6-17 7:58:06 |
0 K |
20 |
★★★ |
| 圆形电流的磁场 |
2007-6-17 7:57:43 |
0 K |
41 |
★★★ |
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