____ electrolyte membrane fuel cells offer high-power density combined with low weight and volume compared with other types of fuel cells.
a. Polymer
b. Ceramic
c. Copper-coated
d. Zinc
a. Polymer
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What are the two main types of hot water heating units used to supply heat to a conditioned space?
What will be an ideal response?
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The fastest growing category of pets today in the United States is:
a. Reptiles c. Birds b. Fish d. Rodents
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The Dark Age of Greece is so-called because
a. it was primitive. b. during this period Greece endured an agrarian crisis. c. the Greece of this period left few material traces. d. the polis did not yet exist in Greece.
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Improperly stored ceiling tiles can expand or warp, causing a poor fit, as a result of _____
a. exposure to temperatures below 10°F b. boxes being stood on edge c. exposure to temperatures above 100°F d. excessive humidity
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