CO2, ammonia, propane, butane, and isobutane are all natural refrigerants.

Answer the following statement true (T) or false (F)


True

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Which of the following is an incorrect statement regarding the venting of a condensing furnace?

a. The intake and exhaust vents should be close together. b. The diameter of the vent pipe is based on the furnace input, the length of the vent, and the number of elbows. c. Installation guidelines for Category IV furnaces should be followed.

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The first medicines used by humans probably came from ____________________

Fill in the blank(s) with correct word

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Where are larger FCU's most commonly used?

What will be an ideal response?

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The 2's complement of 1310 is ________

Fill in the blank(s) with correct word

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