A BJT has measured dc current values of [img=17x17]17d6063b254f8f4.png[/img]= 0.1 mA and [img=16x17]17d6063b32c6cb0.png[/img]= 8.0 mA. When [img=17x17]17d6063b254f8f4.png[/img] is varied by 100 μA, [img=16x17]17d6063b32c6cb0.png[/img] changes by 10 mA. What is the value of the [img=21x21]17d6063b450ad71.png[/img] for this device?（ ）
A: 10
B: 100
C: 80
D: 800
A: 10
B: 100
C: 80
D: 800
举一反三
- 已知随机变量X的分布列如下：[img=386x130]17e43ec4c459e73.png[/img]，则E(X)= A: 17/30 B: m未知，无法求出 C: -30/17 D: -17/30
- A BJT has measured dc current values of IB = 0.1 mA and IC = 8.0 mA. When IB is varied by 100 μA, IC changes by 10 mA. What is the value of the βdc for this device? A: 80 B: 10 C: 100 D: 800
- 求不定积分[img=132x48]17da6537fc8dad6.png[/img]； （ ） A: -(4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) B: (4*(sin(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) C: (4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) D: (4*(cos(x/2)/2 + 2*cos(x/2)))/(17*exp(2*x))
- 给定二阶曲线 [img=139x27]18038a9d815d3af.png[/img] 与点（1,4,0）。则此曲线过该点的切线线坐标为 A: [1, 4, 17] B: [1, 4，-17] C: [4，-1, 17] 和 [4, -1, -17] D: [1，-4，-17] 和 [1, -4, 17]
- 中国大学MOOC: A BJT has measured dc current values of IB = 0.1 mA and IC = 8.0 mA. When IB is varied by 100 μA, IC changes by 10 mA. What is the value of the βdc for this device?