What characteristic must a refrigerant have if it is used as a drop-in replacement for another refrigerant?
A) Similar molecular structure
B) Compatible with existing compressor oil
C) Similar operating pressures and temperatures
D) Higher flammability
Answer: C
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The pointer on a dial-type thermometer is moved by a:
A) Volatile fluid. B) Bimetal element. C) Heat motor and gears. D) Lever that is moved by a column of mercury.
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In drawing, the highlights and reflections are often exaggerated to give the object more impact or a look of realism.
Answer the following statement true (T) or false (F)
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What economic and technical factors affect whether a substance is recoverable and/or recyclable?
What will be an ideal response?
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Ectoparasitic nematodes insert their _________ into root cells
A) stylets B) bodies C) ?heads D) tails
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