【单选题】电路如下图所示。已知稳压管稳定电压Uz=5V,则输出电压为( )V。 10
【单选题】电路如下图所示,已知输入电压uI的波动范围为20V~24V,稳压管的稳定电压UZ=6V,确定输出电压uO的范围。【图片】
【单选题】稳压电路如下图所示,已知E=20V,R1=1200Ω,R2=1250Ω,稳压管Dz的稳定电压Uz=8V,通过Dz的电流为( )。
【单选题】In the liquidity preference framework, a one-time increase in the money supply results in a price level effect. The maximum impact of the price level effect on interest rates occurs
A.
at the moment the price level hits its peak (stops rising) because both the price level and expected inflation effects are at work.
B.
immediately after the price level begins to rise, because both the price level and expected inflation effects are at work.
C.
at the moment the expected inflation rate hits its peak.
D.
at the moment the inflation rate hits it peak.
【简答题】电路如图8-19所示,已知稳压管的稳定电压U Z =6V,晶体管的U BE =0.7V, R 1 =R 2 =R 3 =300Ω,U I =24V。 (1) 说明电路的整流电路、滤波电路、调整管、基准电压电路、比较放大电路、采样电路等部分各由哪些元件组成。 (2) 确定电路输出电压的范围。 (3) 判断出现下列现象时,分别因为电路产生什么故障(即哪个元件开路或短路): ①U O ≈24V; ②U ...
【单选题】关于PowerPoint 2010演示文稿外观设计的叙述,错误的是( )
A.
一篇演示文稿中如果使用了多个设计模板,会自动生成多个的幻灯片母版
D.
幻灯片选定设计模板后,其外观还可以做个性化改变
【单选题】PowerPoint2010 演示文稿是一个文件,以( )为文件名的扩展名
【单选题】一外圆尺寸为Φ20 0 -0.012mm,请选择合适的量具( )。