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【单选题】
Choose the word or phrase that is closest in meaning to the underlined part. Earlier we introduced the concept that the identity of an amplitude modulated message signal may under certain circumstances be communicated by transmitting regular samples of the message, rather than the continuous signal.A.
may transmit samples that are regular in communications under some conditions
B.
may be in the circumstances that regular message samples are communicated
C.
may be conveyed by sending signal sampled at regular intervals under some conditions
D.
may communicate with certain customers by sending regular samples of the message
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