1019，2019“，”，Please invite Mr. Yuan Yuming, director of Beijing Environmental Science Society, to lead the readers“Scientific understanding of electromagnetism ”。
，Teacher yuan“”“”，，：All canAn energetic object，，、、、、，therefore，。Lecture final，：Electromagnetic radiation can cause harm to the body，，，、，We connect with each other more smoothly；、CT，；、，。
，，I learned that only when electricityOver a certain frequency and power，“electromagnetism”，。，，Let life。
The first library of Xicheng District
2019year1023
