Direct digital controls (DDC) operate by:
A) Providing a modulating air pressure in response to monitored conditions.
B) Processing electronic signals with a microprocessor.
C) Providing a varying DC voltage in response to monitored conditions.
D) Turning relay coils on or off to complete circuits.
B
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Fill in the blank(s) with the appropriate word(s).
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What will be an ideal response?
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Fill in the blank(s) with correct word
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What will be an ideal response?