The main valve in a 4-way reversing valve is moved by pressure created by ____.
A. refrigerant boiling in the coil
B. pressure reduction in the condenser
C. change in the action of the metering device
D. low and high side pressure difference
Answer: D
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The PSNT nitrogen soil test is designed to be used in growing ________
A) turfgrass B) fruit trees C) alfalfa D) corn E) any of the above
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