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Identify and state the historical significance of the Harlem Renaissance.
What will be an ideal response?
A period of cultural and political flowering within the African-American community of Harlem in New York City.
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Application for a patent is made to the director of the United States Patent and Trademark Office and typically includes how many components?
A. one B. two C. three D. four
It is important to the HVACR technician to understand the changes of state of matter because:
A) Technicians are required to mix refrigerants to attain proper pressures and temperatures when charging refrigeration systems. B) NATE certification exams require a good understanding of the periodic table of elements. C) The refrigerant recovery process requires a technician to know which state the matter is in to ensure that only like refrigerants are put into a recovery container. D) The cooling and heating process requires a change of state of matter in some form.
How do open display cases maintain the temperature within the case without any doors?
What will be an ideal response?
When charging a system with vapor refrigerant from a refrigerant cylinder, the cylinder will become ____.
A. cold B. very warm C. the same temperature as the ambient air D. very cold