What is the value of thermal voltage.()
A. 0.25 eV
B. 0.026 eV
C. 0.0026 eV
D. 0.02 eV
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What is the relationship between the space charge width and doping concentration.()
A. No relationship
B. Proportional
C. Inverse proportion
D. Exponential
The build-in electric field is from p region to n region. ( )
共聚物的组成F1随着转化率增大而变化的体系有（ ）
A. r1 < 1，r2 <1
B. r1=r2=1
C. r1>1，r2<1
D. r1=r2=0
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