Explain why furnace efficiencies jump from 80% to 90%
What will be an ideal response?
Efficiencies above 80% cause condensation either in the furnace or in the vent. The flue gas for efficiencies below 90% is too hot for PVC vent. So the vent on a furnace between 80% and 90% must withstand high temperature and water, making it impractical.
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Explain how the national parks are classified
What will be an ideal response?
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Most weeds are killed more easily when they are young and in active growth
Indicate whether the statement is true or false
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Ans: b
a. 100 c. 1,000 b. 10,000 d. 10
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_____ was introduced to the New World by European explorers.
A. Syphilis B. Maize C. Tobacco D. Smallpox E. Pumpkin
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