For a video shot in a city park, all of the following are examples of natural sound except:

a. birds chirping
b. planes passing overhead
c. children playing nearby
d. post-production voiceover


D

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Portland cement plus lime (PCL) and sand are three particulate materials in mortar. In this mix, sand is three times that of PCL. Is this 3:1 relationship by weights of the materials or by their volumes?

What will be an ideal response?

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The abbreviation for refrigerants containing chlorine, fluorine, carbon, and hydrogen is ____.

A. HFC B. HCFC C. CFC D. HFAC

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The ability to measure AC current is useful when diagnosing ____________

A) Alternator function B) Resistance in a battery cable C) Starter motor operation D) None of these

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Balancing valves are required

A) to create negative pressure. B) to allow adjustable flow. C) on single circuit loops. D) on venturi pipe systems.

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