Which of the following ingredients and conditions are required to produce photochemical smog?
A. sulfur, PM and high humidity
B. coal dust and carbon dioxide
C. HC+NOx+sunlight+time
D. PM and VOCs
Answer: C
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Since passage of the Wild Horse and Burro Act of 1971 both wild horses and burros have:
A) shown large declines on most ranges. B) shown no change in numbers on most ranges. C) shown large increases on most ranges.
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Which of the following is a critical operating parameter that should always be checked on water source systems?
A) water flow B) TEV adjustment C) suction pressure D) discharge pressure
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Which of the following refrigerant safety designations indicate the refrigerant is hazardous at levels of 400 parts per million or less?
A) B1 B) A2 C) A1 D) A3
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Find the average signal power of the periodic signal x(t) in Figure E.32.
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