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Acostak1 Acostak1
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6 years ago
To ensure safe usage of nitrous oxide for dental personnel, the chairside personnel exposed to nitrous oxide should be checked ________ a year.
 a. once
  b. twice
  c. four times
  d. twelve times
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FvhdanFvhdan
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6 years ago
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Acostak1 Author
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You make an excellent tutor!
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Good timing, thanks!
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