The necessary conditions for generating laser are
A、A working medium that can produce a flip in the number of particles Buju;
B、A resonant cavity;
C、Pump source;
D、Mode-locked crystal
发布时间：2025-02-16 11:04:48
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答案：A working medium that can produce a flip in the number of particles Buju ■A resonant cavity ■Pump source
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