Which nutrient is needed for the formation of strong cell walls?
a. Aluminum c. Copper
b. Calcium d. Boron
B
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Power ______________ is the ratio of output power to input power.
Fill in the blank(s) with the appropriate word(s).
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By using an adjustable wrench
Air brake
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Each occupant must have ready access to ____ protecting the conductors supplying that occupancy.
A. primary feeders B. all overcurrent devices C. panel boxes D. service laterals
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When calculating the specific gravity of gas, the substance used as the comparative constant in the formula is:
A) Air. B) Nitrogen. C) Natural gas. D) Oxygen.
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