Coal in the United States is primarily used for electricity production
Indicate whether the statement is true or false.
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In a typical multi-orifice, hydraulic injector nozzle, what force holds the nozzle valve on its seat?
A. spring force B. fuel pressure C. combustion pressures D. compression pressures
The person most responsible for defusing the tariff controversy that began in 1828 was
A. Andrew Jackson. B. John C. Calhoun. C. John Quincy Adams. D. Daniel Webster. E. Henry Clay.
Most computer-controlled actuators are ____ that convert the output commands from the computer into mechanical action.
A. electromechanical devices B. switches C. sensors D. valves
Rooftop units should not be installed in close proximity to exhaust vents or industrial processes that create fumes because:
A) The heat from the rooftop unit might cause down drafts. B) The exhaust might stain the side of the unit. C) The exhaust can be pulled into the unit's outdoor air intake. D) The roof supports are weaker near the vents.