The head and tail commands, allow you to view the first few or last few lines of a file (____ lines by default).
A. five
B. ten
C. fifteen
D. twenty
Answer: B
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What is spatial data?
What will be an ideal response?
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A room in which volatile flammable disinfecting agents are stored is considered a Class I, Division 1 location _____.
a. 5 feet below the ceiling and includes the area above a drop ceiling b. 5 feet below the ceiling to the floor c. 5 feet above the floor d. from floor to ceiling
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Although it is no longer used in the manufacturing of new air conditioning systems, the number of existing systems using __________ is large, so technicians will be encountering this refrigerant for many years to come.
A. R-22 B. R-12 C. R-410A D. R-134a
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A system has an impulse response 
What is its null bandwidth?
What will be an ideal response?
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