¿Qué es absolutamente necesario en los sistemas criogénicos?
a. Un acabado de revestimiento de aluminio
b. El ajuste ceñido del material
c. Alambres de fijación
d. Almohadillas extraíbles en las bridas y las válvulas
b. El ajuste ceñido del material
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useful variable of traffic information is density—how many cars occupy a stretch of a highway.
a. True b. False
Two types of fixed metering devices are:
A) Copper and brass. B) Capillary tubes and orifices. C) Pressure reducing and pressure increasing. D) high pressure and low pressure.
Open-web steel joist, used to support floors and roof decks, are also known as _____
a. web trusses b. tension rafters c. bar joists d. lattice beams
To pull a vacuum means to ____.
A. raise the pressure in a refrigeration system B. lower the pressure in a refrigeration system below atmospheric C. allow refrigerant to escape into the atmosphere D. condense the gas in the system