单选题Operational amplifiers, used primarily in analog circuits, are characterized by（）A high input impedance, high gain and low output impedanceB high input impedance, high gain and high output impedanceC low input impedance, low gain and high output impeda

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单选题

Operational amplifiers, used primarily in analog circuits, are characterized by（）

high input impedance, high gain and low output impedance

high input impedance, high gain and high output impedance

low input impedance, low gain and high output impedance

low input impedance, high gain and low output impedance

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Which of the following is primarily used for VoIP?()

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参考答案：D

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正确答案：C

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正确答案:D

Operational amplifiers, used primarily in analog circuits, a

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