Which of the following refrigerants has the lowest ozone depletion potential?

a. CFC-12
b. HCFC-22
c. HCFC-123
d. HFC-134a


d. HFC-134a

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Steel reinforcement in concrete elements that are permanently exposed to the earth, such as in footings, must have a minimum concrete cover of

A) 5 in. B) 4 in. C) 1 in. D) 3 in. E) 2 in.

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There are up to _____ SS/PBCH beams in the sub-3 GHz frequency range, up to _____ SS/PBCH beams in the frequency range between 3 and 6 GHz, and up to _____ SS/PBCH beams in the mmWave spectrum.

A. 4, 8, 64 B. 2, 4, 8 C. 8, 64, 128 D. 14, 28, 32

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The primary source of charge for 2:1 type clay minerals is ionization of the surface hydroxyl groups on the tetrahedral sheets

Indicate whether the statement is true or false

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In a standard hydraulic system, a diverter valve _____

a. stops fluid flow b. has a rotating core c. has the same function as a check valve d. redirects the flow from one component to another

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