The ____ battery cell is commonly used in hearing aids.
A. lead-acid
B. sodium-sulfur
C. nickel-metal
D. zinc-air
Answer: D
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The triac is a member of the thyristor family, which means that it has only two states of operation, on and off.
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A pipe hanger that has a load rating of 500 pounds must be able to support _____ pounds.
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