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
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
List five road design features shown by detail drawings.
What will be an ideal response?What will be an ideal response?
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.