激光的产生是A．定向辐射B．换能辐射C．电离辐射D．受激辐射E．自发辐射

作者: rantiku 人气: - 评论: 0

问题激光的产生是

选项 A．定向辐射 B．换能辐射 C．电离辐射 D．受激辐射 E．自发辐射

答案 D

解析

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