题目内容

Loudspeaker is a transducer which converts the state of the controlled quantity to an electrical signal.

A. 对
B. 错

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Audio amplifier can increase the strength(power) of the audio signal.

A. 对
B. 错

Power amplifier can decrease the strngth(power) of th udio signal.

A. 对
B. 错

Microphone is a transducer which converts sound to voltage.

A. 对
B. 错

A circuit diagram is useful when testing a circuit and for understanding how it works.

A. 对
B. 错