When applying duct insulation with the adhesive method, how far apart should strips of adhesive be

applied around the outside of a duct?

a. 6 inches
b. 8 inches
c. 10 inches
d. 12 inches


a

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Fractions are commonly used in pipe fabrication for dimensioning a distance that is less than _____.?  

A. 1 inch? B. 1 foot? C. 1 meter? D. 1 mile?

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Most gas furnaces and appliances use a(n) ____ burner.

A. compressed B. hybrid C. pressurized D. atmospheric

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The domestic cat that humans use as a companion animal evolved from mammals in two genus groups: Profelis and ______.

Fill in the blank(s) with the appropriate word(s).

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A medical researcher wants to determine whether exercising can lower blood pressure. She recruits 100 people with high blood pressure to participate in the study. She assigns a random sample of 50 of them to pursue an exercise program that includes daily swimming and jogging. She assigns the other 50 to refrain from vigorous activity. She measures the blood pressure of each of the 100 individuals both before and after the study.

a. Is this a controlled experiment or an observational study? b. On the average, the subjects in the exercise group substantially reduced their blood pressure, while the subjects in the no-exercise group did not experience a reduction. The researcher concludes that exercise decreases blood pressure. Is this conclusion better justified than the conclusion in Exercise 8? Explain.

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