题目内容
(请给出正确答案)
[主观题]
Ruby laser is a ().
A、Three-level system
B、Four level system
C、Two level system
D、Five level system
提问人:网友zergling07
发布时间:2022-01-07
A、Three-level system
B、Four level system
C、Two level system
D、Five level system
A、calmness
B、depression
C、sadness
D、depression and sadness
B、N1 <n2>
C、N1=N2
D、N2=0
A、①②③④
B、①③④⑤
C、①②③
D、③④⑤
A、a pn junction with Eg1= Eg2=0
B、a pn junction with Eg1= Eg2=0.9 eV
C、a pp junction with Eg1=0.7 eV and Eg2=0.9 eV
D、a pn junction with Eg1= Eg2=1.1 eV
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