工作于放大状态的PNP管,各电极必须满足()
A. VC > VB >VE
B. VC< VB < VE
C. VB >VC > VE
D. VC > VE > VB
引种驯化试验包括()
A. 种源试验
B. 品种比较试验
C. 区域试验
D. 繁殖推广
Chinese language is written in the form of__, so people also call Chinese characters “Fang Kuai Zi” in Chinese()
A. square
B. circle
C. rectangle
D. triangle
当NPN型三极管的VCE > VBE且VBE >0.5V时,则三极管工作在()
A. 截止区
B. 放大区
C. 饱和区
D. 击穿区