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【单选题】
下列关于激光器理论哪些说法是错误的?A.
激光器的半经典理论称为兰姆理论
B.
该理论是由兰姆在1968年开始的
C.
半经典理论中将物质原子用量子力学描述
D.
半经典理论能解释拉姆凹陷现象
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