Early concrete masons combined quick lime and moist sand, placed the mixture in a mold under pressure, and cured it with steam to make a usable block.

Answer the following statement true (T) or false (F)


True

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When a contractor employs union labor, the typical labor agreement covers the work, conditions, and ____.

A. project duration B. material costs C. wage rates D. training

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Technician A says that all O- rings are OK to use with R 134a systems. Technician B says that the color of the O-ring indicates the material it is made from. Who is correct?

A) Technician A B) Technician B C) Both technicians D) Neither technician

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Round sheet metal ductwork should be:

A) Fastened with sheet metal screws and sealed with mastic. B) Fastened with duct tape and sealed with mastic. C) Fastened and sealed with mastic. D) Fastened and sealed with duct tape.

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pH measurements are based on __________ in a solution.

A. all ions B. hydrogen C. hydroxyl

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