Using research tools, identify another technological invention (device, chemical, or process) that was developed for a beneficial purpose but is resulting in unintended and unwanted consequences.
What will be an ideal response?
Then refrigerators were being developed for the mass market, the gases used as refrigerants were toxic and dangerous. Charles Kettering, a scientist working for DuPont, developed an alternative refrigerant known as Freon. This gas appeared to be a perfect solution to the problem. It appeared to be almost inert (didn’t react with other chemicals), and it wasn’t toxic or flammable. From that time onward, Freon was used when a refrigerant was
needed, so it was found in refrigerators, freezers, and air condition systems in homes, automobiles, and offi ces. In the 1970s, it was discovered that chlorofl uorocarbons (CFCs) in Freon were damaging the Earth’s ozone layer.
CFCs reacted when they found their way to the upper atmosphere. From 1990 onward, Freon and all other CFCs were banned for use as a refrigerant.
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Provide the spelled-out versions of the acronyms "CMAA" and "CMAR." Then, explain the differences between the two project delivery methods. Use sketches to illustrate the contractual relationships between various parties involved in both methods.
What will be an ideal response?
? Piping systems can be divided into four major categories: collection, transportation, distribution, and _____.
A. ?processing B. ?clay C. ?storm water D. ?natural gas
Which of the following is NOT a factor that affects the wage level decision?
a. Industry averages b. Law of supply and demand c. What other employers in the area are paying d. Job evaluation e. Ability to pay
The parking brake cable can be adjusted in most cases at the ________
A) Star wheel adjusters B) Link C) Equalizer D) Operating lever