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radio-frequency spectrum

n.
1.the entire spectrum of electromagnetic frequencies used for communications

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  • radio-controlled aircraft
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    Idiom of the Day

    inside out
    with the inside facing the outside
    The woman turned her purse inside out in order to look for her lost key.



    1.
    The television (a) / was discovered (b) by John Baird. (c) /No error (d)

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