【单选题】对于图题4.28所示功率放大电路,假设二极管的正向导通压降和三极管的发射结电压相等,下面错误的描述是()。【图片】
A.
输入电容C1的极性是右正左负,静态时电容上的电压为
B.
输出电容C2的极性是左正右负,静态时电容上的电压为 ,负载上的电压为零
C.
T3、T4管构成的复合管,相当于PNP管,提高了功率管的电流放大系数和输入电阻
D.
T1、T2管构成的复合管,相当于NPN管,提高了功率管的电流放大系数和输入电阻
【简答题】She began to like painting after ____________(retire).
【单选题】She began painting in her .
【多选题】不考虑增值税,下列事项中,只引起会计恒等式一边增减变动的有( )。
【单选题】Impressionism, in painting, developed in the late nineteenth century in France. It began with a loosely structured group of painters who got together mainly to exhibit their paintings. Their art was c...
【单选题】不考虑增值税,下列交易或者事项中,只引起会计恒等式一边增减变动的有( )。
【单选题】线型定温火灾探测器发生断线时,表示( )。
【多选题】不考虑增值税,下列事项中,只引起会计恒等式一边增减变动的有( )。