Possible heat sources for a storage-type water heater include:
A. a separate boiler.
B. solar panels.
C. its own input source and controls.
D. All are correct.
Answer: D
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La iluminación que proporciona un nivel uniforme de iluminación para grandes habitaciones, recepciones y pasillos se clasifica como iluminación______.
a. general b. acentuada c. para tareas d. de baño de luz
Si la carga continua de un circuito derivado se mide en 20A, ¿qué amperaje debería tener la protección contra sobrecorriente?
a. 15A b. 20A c. 25A d. 30A
Most engineering drawings include three views:
A. Top, front, and left-side B. Top, front, and bottom C. Front, right-side, and left-side D. Top, front, and right side
A periodic discrete-time signal x [n] is exactly described for all discrete time by its DFT
(a) Write a correct analytical expression for x [n] in which 
, “j ,” does not appear.
(b) What is the numerical value of x[n] at n = ?10?