【单选题】电路及参数如图所示,三极管为硅管,其 V BEQ =0.7V,设r o =∞,I o =10mA,R C1 =R C2 =1KΩ,V CC =12V,β1=β2=72,T 1 、T 2 、单管电压放大倍数均为-100, V i1 =3mV, V i2 =3mV,则空载输出电压 V o1 、 V o2 、 V o 分别为()
【简答题】请从下列单词中,选择正确的单词填在下面6句话的横线上,确保每个句子意思正确。(需要手动输入) bored tired worried excited annoyed sad I am _______________ because I'm going on holiday tomorrow.
【简答题】完形填空。 I am American. 1 name is Rose. I am twelve. I 2 two friends. They're 3 . 4 names are Mary and Betty. 5 all like sports. I 6 soccer ball. Mary likes 7 , too. Betty likes basketball. She 8 . six b...