The highest level of respiratory protection is provided by _____.

a. air-purifying respirators
b. supplied-air respirators (SAR)
c. self-contained breathing apparatus (SCBA)
d. exhaust hoods


c. self-contained breathing apparatus (SCBA)

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What breaks down to form poisonous gas in the presence of flames?

A) A1 refrigerant only B) Compressor insulation C) Halogenated refrigerants D) Refrigerant oil

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Which of the following is an advantage of a multistage centrifugal pump?

A. Low initial cost B. Inexpensive parts C. Requires a smaller amount of space D. Decreased operating problems

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List five road design features shown by detail drawings.

What will be an ideal response?What will be an ideal response?

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Las instalaciones de capa doble:

a. no necesitan uniones de expansión. b. no necesitan que las uniones estén escalonadas. c. suelen tener su capa exterior sujeta con alambres. d. se utilizan en aplicaciones de temperaturas altas.

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