Sensors for the mixing valve control are located:
A) On the supply line and on the boiler.
B) Outside the building and on the supply line.
C) Outside the building and on the boiler.
D) Outside the building, on the supply line, and on the boiler.
D
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What causes the nitrogen and the oxygen in the air to combine and form oxides of nitrogen?
A) Chemical reaction in the catalytic converter B) Any spark C) Heat above 2500°F (1370°C) D) Sunlight
The Second Great Awakening tended to
A. promote religious diversity. B. reduce social class differences. C. blur regional differences. D. discourage church membership. E. weaken women's social position.
A phasor rotating at a constant rate will generate a(n)____________
A. sine wave B. angular velocity C. waveform D. amplitude