A sensor that uses a light beam and a detecting plate to alarm if the light beam is obstructed is most commonly used to identify which of the following threats?
A. Power
B. Smoke
C. Natural Gas
D. Water
E. Toxins
A sensor that uses a light beam and a detecting plate to alarm if the light beam is obstructed is most commonly used to
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answerhappygod
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A sensor that uses a light beam and a detecting plate to alarm if the light beam is obstructed is most commonly used to
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