选择题:________ the concert had begun did we realize what

题目内容:
________ the concert had begun did we realize what a splendid show it was going to be.(本题1.0分)
A、 No sooner
B、 . Only after
C、 . hardly
D、 Scarcely
参考答案:

、4既要使放大电路具有稳定输出电流的作用,又要提高其输入电阻,应采用下列()种反馈方式。A、电流串联

、4既要使放大电路具有稳定输出电流的作用,又要提高其输入电阻,应采用下列()种反馈方式。A、电流串联负反馈B、电压并联负反馈C、电流并联负反馈

查看答案