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Identify and state the historical significance of "three sister" farming.
What will be an ideal response?
A farming technique that allowed for high-yield production of beans, corn, and squash. This agricultural innovation allowed for the development of greater population density.
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The temperature of the refrigerant as it leaves the compressor on the discharge side should be ________.
A) Cold B) Hot C) Warm D) Cool
The term picture window implies ________.
A) a fixed window. B) a fixed window whose height is greater than its length. C) a fixed window whose length is greater than its height. D) an operable window. E) none of the above.
Which of the following is a promising new refrigerant lubricant?
A) Polyalkylene glycol B) Mineral oil C) Polyvinylether D) Polyol ester
In a feedforward system, the following error signal is kept at zero if __________.
A. C = E and FF = F B. C = FF and E = F C. C = F and FF = E