When the laser is in a steady state,Rate of coherent photon loss in the cavity= Rate of stimulated emissions
A、正确
B、错误

A. 讲读、讲述、讲解、报告
B. 讲读、讲述、讲解、讲演
C. 讲读、讲述、讲演、谈话
D. 讲读、讲述、讲解、讨论

A. 讲授法和谈话法
B. 演示法和参观法
C. 实验法和练习法
D. 讨论法和发现法