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<{p}>The modulator generates a varying signal at its output <{u}>which is proportional in some way to the signal<{/u}> appearing across its input terminals.<{/p}>

发布于 2021-04-13 16:27:39

【单选题】
A which is produced in the same way as the signal
B which comes partially out of the signal
C which varies in an unknown manner with the signal
D certain attribute of which varies in proportion to the signal

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915158822 2023-04-13

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