题目内容
Microphone is a transducer which converts sound to voltage.
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A circuit diagram is useful when testing a circuit and for understanding how it works.
Drawing circuit diagrams is difficult and takes a lot of practice to draw neat, clear diagrams.
Output Transducer converts the electrical signal to the controlled quantity.
成人发生气道异物梗阻时，若身边没人，意识清楚的情况下，应立即向他人求救，采用海姆立克急救法协助其排除异物。
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