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huhs huhs
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6 years ago
A frangible bulb heat detector is activated when:
 
  A. a beam of light is reflected onto a photoelectric cell to complete a circuit.
  B. ionized molecules make air less conductive, causing a decrease in current.
  C. a chemical pellet melts, releasing a pressurized plunger to complete a circuit.
  D. a small glass vial breaks when heated, allowing electrical contacts to complete a circuit.
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isa
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6 years ago
D
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