I walked slowly through the market, where people all kinds of fruits and vegetables.I studied the prices carefully and bought what I needed.
A.
sell
B.
were selling
C.
had sold
D.
have sold
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参考答案:
举一反三
【判断题】在图示电路中,已知晶体管静态时 U BEQ =0.7V ,电流放大系数为 β =100 , r be =1 kΩ , R B1 =5 kΩ , R B2 =15 kΩ , R E =2.3 kΩ , R C =R L =3 kΩ , V CC =12V 。则电路的电压放大倍数是 A u =150 。( )