A specially constructed microphone attached directly to an object or surface to be protected, which responds only when the protected object or surface is disturbed, is known as:
A. Parabolic microphone
B. Special audio microphone
C. Contact microphone
D. Surreptitious microphone
E. None of the above
A specially constructed microphone attached directly to an object or surface to be protected, which responds only when t
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A specially constructed microphone attached directly to an object or surface to be protected, which responds only when t
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