List four major detrimental effects that are directly related to the construction and use of our highway transportation system.
What will be an ideal response?
There are many benefits that have come from the highway system; however, these benefits have not come without significant costs. The most obvious cost is that of safety, highway accidents claim approximately 40,000 lives each year. The transportation system also creates air, water, and even noise pollution. It also spoils and changes forever the natural beauty of an area, and consumes vast quantities of precious energy resources.
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Los sistemas de temperatura dual:
a. se aíslan para protección personal. b. se aíslan solo para los servicios calientes. c. están completamente aislados, incluida una barrera de vapor. d. no requieren aislamiento.
Rigid insulation can be installed on the interior surfaces of a foundation if the walls _____.
a. are adequately waterproofed b. are poured concrete, not block c. have had furring strips applied d. have cured at least 72 hours
What material should be used to backfill immediately behind a retaining wall?
a. free-draining angular fill b. compacted soil c. sand d. pea gravel
An antiparallel network __________.
A. is a rectifier connected in parallel with the converter B. has components connected in the opposite direction of the components in the converter C. is connected between the power lines and the intermediate section D. all of the above