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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