If electric heating elements are used in conjunction with a heat pump, when do they operate?
A) The electric heating elements operate whenever the heat pump is not operating.
B) The electric heating elements operate simultaneously with the heat pump.
C) The electric heating elements operate in the first stage.
D) The electric heating elements operate in the second stage.
D
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A. Shop Production System B. Customer Satisfaction System C. Banking System D. Customer Service System
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A. ?ammonia and sodium B. ?alum and sulfer C. ?aluminum and silicon D. ?aluminum and silver
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A. the brake pedal B. lugging C. the no-power mode D. split shifting