The EPA requires the repair of refrigerant leaks:

A) For all types of leaks in all kinds of systems.
B) Only in systems containing HFC refrigerant.
C) Only in systems with a refrigerant charge greater than 50 lb.
D) Only in systems containing CFC refrigerant.


C

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Una estructura rígida que se proyecta desde un soporte vertical de manera que la parte superior se manifieste por tensión y la parte inferior por compresión es un/a _____.

a. viga voladiza b. brazo del mástil c. pluma del motor para levantar cargas d. barra separadora

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Fuel cells generate electricity at efficiencies of 40 percent and ____ with cogeneration systems that use the excess heat.

a. 50 percent b. 65 percent c. 80 percent d. 95 percent

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Genetic engineering is based on a technology involving recombinant DNA

Indicate whether the statement is true or false.

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In Sec. 8.1, it    was stated that a high?purity Cu specimen, after 30 percent deformation at room temperature was found to have a recoverable strain energy of about 25 J/gmol. The Burgers vector for Cu is 0.236 nm, and the shear modulus about 5.46 ? 10????. Determine the dislocation density of an array of uniformly distributed alternating right and left?hand screw dislocations in the Cu that might possess this amount of strain energy.

What will be an ideal response?

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