互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒The tower， consisting of five stories of elevation structure， is stretchable. Its maximum height is 20.7 meters and maximum load is 20 tons.
Design and construction of the tower lasted a year and 30 tons of steel was used.
MAIN STAGE
The round stage is 20 meters in diameter and 1.7 meters high， with a circle of steps in the periphery.
The Main Stage is equipped with four rotating stairs and four round rotary elevating platforms 1.6 meters in diameter， the height of elevation being 2.8 meters.
AERIAL EQUIPMENT
Ten steel ropes are above the field， with a total weight of 40 tons.
MUSIC
Nineteen composers created 30 hours of music for the closing ceremony. A total of 600 hours was spent on the recording.
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