文件内容:
file:3.蒸汽机和火车.mov
file:12.火箭和人造卫星.mov
file:1.认识发明.mov
file:7.电报和电话.mov
file:思维导图.jpg
file:6疫苗和杂交水稻.mov
file:4.汽车和流水线.mov
file:5.电池和炸药.mov
file:8.计算机和万维网.mov
file:9.显微镜和望远镜.mov
file:11.雷达和X射线.mov
file:8.石墨与金刚石.mov
file:5.岩石中的能源.mov
file:12.来自生物的宝石.mov
file:3.沉积岩.mov
file:2.岩浆岩.mov
file:7.矿物的识别.mov
file:10.石英与石盐.mov
file:11.矿物宝石和玉石.mov
file:4.变质岩.mov
file:9.金银铜铁.mov
file:6.陨石.mov
file:10.化学与生命.mov
file:1.认识化学.mov
file:3.水.mov
file:5.特殊金属.mov
file:8.酸与碱.mov
file:2.空气.mov
file:12.化学改变世界.mov
file:4.金属.mov
file:6.碳.mov
file:11.化学与赌.mov
file:7.溶解.mov
file:4.鱼的呼吸.mov
file:3.鱼的运动.mov
file:思维导图.jpg
file:6.取食和排泄.mov
file:12.奇特的鱼.mov
file:1.认识鱼类.mov
file:7.鱼的繁殖.mov
file:10.洞穴鱼.mov
file:11.汽水鱼.mov
file:5.鱼的感觉.mov
file:2.鱼的外形.mov
file:2.轮子.mov
file:思维导图.jpg
file:6.螺旋.mov
file:9.计时和算数的机械.mov
file:11.提升高度的机械.mov
file:7.齿轮和传送带.mov
file:5.斜面与楔子.mov
file:4.滑轮.mov
file:8.放大力气的机械.mov
file:10.加快速度的机械.mov
file:1.杠杆.mov