Most hydronic heating systems are
A) Open systems in cooling and closed systems in heating
B) Closed piping systems
C) Closed systems in cooling and open in heating
D) Open piping systems
B
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Debe utilizar _____ para alisar el borde interior filoso de un conducto de metal después de cortarlo.
a. una lima plana b. una navaja c. papel de lija rugoso d. un escariador
Threads that are very strong and are used to transmit power and motion in either direction are:
A. Buttress threads B. Acme threads C. Worm threads D. Unified inch screw threads
What input sensor is found in the fan section?
A) Low temperature thermostat B) Filter status toggle switch C) Mixed-air temperature sensor D) Supply-air temperature sensor
Why are hidden lines generally omitted in a sectional view?
What will be an ideal response?