Which HFC refrigerant has taken the place of R-12 for use in domestic refrigeration?
A. R-134a
B. R-404A
C. R-409A
D. R-410A
Answer: A
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On an ISO, all horizontal lines are projected at _____ degrees.
a. 15 b. 30 c. 45 d. 90
Ten kg of copper (use Cp,cu = 0.39 kJ/kg·K) at 200°C are submerged in 50 kg of water at 10°C in an insulated container. After a long time, the temperature will be nearest:
A) 35.5°C B) 28.5°C C) 20.5°C D) 13.5°C
Most practical calculations are generally limited to only ___ significant digits.
a. one b. two c. three d. four
Are the Spanish conquistadores to be considered villains or heroes or both for their actions in the Americas? Assess and evaluate the short-term and long-term influence of the Spanish conquistadores on political, economic, religious and social developments in southwestern North America, the Caribbean Islands, and South America. Analyze the key developments in the relationships of the Spanish conquistadores with the Indian peoples of these three regions of the Americas.
What will be an ideal response?