____ are inert gases that are commonly added to the air space between glass panes in insulated glass to lower the U-factor.
A. Helium and krypton
B. Xenon and argon
C. Argon and krypton
D. Radon and Xenon
Answer: C
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A. Presper B. Cummins C. Ford D. Eckert
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The most common kind of landfill is the ____ landfill
A) trench fill B) at-grade C) canyon fill D) multigrade
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Fill in the blank(s) with the appropriate word(s).
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