入射光子激发原子从高能级跃迁到低能级时所发生的光辐射称为()A.激发 B.辐射 C. 发布时间:2017-10-27 05:13 │ 来源:www.tikuol.com 题型:单项选择题 问题: 入射光子激发原子从高能级跃迁到低能级时所发生的光辐射称为()A.激发B.辐射C.折射D.自发辐射E.受激辐射
题型:单项选择题 一Did you stay at home yesterday morning, Sue? —No, I ______ to the mountains with my cousin. [ ]A. go B. went C. goes D. am going 查看答案