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snowfairy2611 snowfairy2611
wrote...
Posts: 796
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6 years ago
Smoke detectors most commonly encountered by firefighters operate on the principles of __________ or __________.
 
  Fill in the blank(s) with correct word
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wrote...
6 years ago
Ionization, photoelectric
snowfairy2611 Author
wrote...
6 years ago
Thanks
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