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A radio station works at 800 kHz and uses AM. If this is a public broadcast system, it should transmit using | |
A. | parabolic reflector to transmit all round [Wrong Answer] |
B. | turnstile antenna for the required land [Wrong Answer] |
C. | half wave long horizontal wave [Wrong Answer] |
D. | a vertical antenna less than quarter for practical reasons [Correct Answer] |