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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 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

Answer: C

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