超星 - Lesson 7 Listening and understanding - 查题吧

单选题

Analog circuits include _________,oscillators, filters and power suppliers.

A. voltage
B. amplifier
C. sine wave
D. feedback

单选题

______is the device that provides amplification(the increase in current, voltage, or power of a signal)without appreciably altering the original signal.

A. analog
B. digital circuit
C. amplifier
D. power supplier

单选题

In the common-emitter circuit, the base terminal of the transistor serves as the input, the collector is the output, and the______is common to both.

A. base
B. emitter
C. substance
D. collector

单选题

If there is no voltage gain, but the output power is greater than the input power, the amplifier is a _______ amplifier.

A. voltage
B. power
C. transistor
D. operational

单选题

Electronic circuits can be divided into ____groups:analog and digital.

A. two
B. three
C. one
D. four

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