【单选题】设下图所示电路中 T 1 、 T 2 特性理想对称,且 β = 100 , U BEQ = 0.7V , r be = 2.5kΩ ,电源电压 U CC = U EE = 15V ,电阻 Re = 15k Ω , Rc = 10kΩ 。 差模电压放大倍数 A ud = ( ) 。
【单选题】下图中, T 1 ~T 4 的 β =120 , r b =200 Ω,r ce3 =50kΩ , r be =5.4kΩ , R c1 =R c2 =R c =10kΩ , R e3 =R e4 =100Ω , R=4.3kΩ , R b1 =R b2 =R b =1kΩ , +V CC =+12V,-V EE =-6V , V BE =0.7V 。计算该电路的差模电压增益 A VD1 。
【单选题】下图中, T 1 ~T 4 的 β =120 , r b =200 Ω,r ce3 =50kΩ , r be =5.4kΩ , R c1 =R c2 =R c =10kΩ , R e3 =R e4 =100Ω , R=4.3kΩ , R b1 =R b2 =R b =1kΩ , +V CC =+12V,-V EE =-6V , V BE =0.7V 。计算该电路的差模电压增益 A vd1 。
【判断题】由于诚实信任的介入导致契约责任和违约责任之间的界限变得模糊不清。
【简答题】任务型读写。 Dennis Hopper, who was described as “Easy Rider’s” biker Billy and “Blue Velvet’s”, died of cancer Saturday morning at his home in Venice, California.He was 74. Hopper, who was diagnosed with c...
【单选题】下图中, T 1 ~T 4 的 β =120 , r b =200 Ω,r ce3 =50kΩ , r be =5.4kΩ , R c1 =R c2 =R c =10kΩ , R e3 =R e4 =100Ω , R=4.3kΩ , R b1 =R b2 =R b =1kΩ , +V CC =+12V,-V EE =-6V , V BE =0.7V 。计算该电路的差模输入电阻 R id 。
【单选题】通常有()种方式可以启动发射EPIRB信号
【单选题】某企业投资方案甲的年销售收入为180万元,年销售成本和费用为120万元,其中折旧为20万元,所得税税率为25%,则该投资方案的年现金净流量为( )。
【判断题】由于诚实信任的介入导致契约责任和违约责任之间的界限变得泾渭分明。 ()