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Author Question: A ventilation problem may exist when the carbon dioxide level in a room exceeds _____. a. 500 ppm ... (Read 31 times)

ap345

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on: Jul 24, 2018
A ventilation problem may exist when the carbon dioxide level in a room exceeds _____.
 
  a. 500 ppm
  b. 600 ppm
  c. 800 ppm
  d. 1,000 ppm

Question 2

The most common source of radon is uranium in _____.
 
  a. soil and rocks
  b. well water
  c. industrial emissions
  d. nuclear waste


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Galvarado142

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Reply #1 on: Jul 24, 2018
Answer to Question 1

d

Answer to Question 2

a


ap345

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Reply #2 on: Jul 24, 2018
Both answers were spot on, thank you once again


Galvarado142

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Reply #3 on: Jul 24, 2018
Great! Please up vote :D


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