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【单选题】
理想运算放大器的两个输入端的输入电流等于零，其原因是（ A ）。A.
放的差模输入电阻接近无穷大
B.
同和反的输入电流相等而相位相反
C.
的开环电压放大倍数趋于零
D.
的开环电压放大倍数接近无穷大
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【单选题】听力原文：W: I drink very little as a rule, you know it, Ingrid. M: Ah well, Hugh, here's to us and to old times and old acquaintance. I met some of the old gang today, Hogan seems to be in a bad way. What...
A.
Hogan has got lots of dogs.
B.
Hogan is going in a big way.
C.
Hogan is suffering in poverty.
D.
Hogan sits on a commission.