电路如图所示为光控电路的一部分,它将连续变化的光电信号转换成离散信号(即不是高电平,就是低电平),电流 I 随光照的强弱而变化。下列分析判断正确的是( )。
A.
A l 工作在线性区, A 2 工作在非线性区。
B.
A l 实现电流与电压的变换, A 2 是反相输入的滞回比较器。
C.
A 2 下门限是0.5V,上门限是5.5V。
D.
A l 的输出电压增大到上门限时, A 2 输出从-5V跳变到+ 5V。
E.
A l 的输出电压下降到下门限时, A 2 输出从-5V跳变到+ 5V。
F.
两个门限电压对应的输入电流分别是5μA和55μA
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【单选题】'Underprivileged people' is often used by the mass media as a substitute for 'poor people'. Linguistimlly, the former is referred to as a(n) ______.
【单选题】'Underprivileged people' is often used by the mass media as a substitute for 'poor people' Linguistically, the former is referred to as a(n) ______.