A specially constructed microphone attached directly to an object or surface to be protected and that responds only when the protected object or surfaced is disturbed is known as a:
A. Special acoustic microphone
B. Parabolic microphone
C. Contact microphone
D. Radio frequency microphone
E. Vibration microphone
A specially constructed microphone attached directly to an object or surface to be protected and that responds only when
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A specially constructed microphone attached directly to an object or surface to be protected and that responds only when
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