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标题: 求助 TT GWD 9-29 [打印本页]

作者: j96111 时间: 2007-5-6 22:46
标题: 求助 TT GWD 9-29

The emission of sulfur dioxide when high-sulfur coal is burned is restricted by law. New coal-burning plants usually comply with the law by installing expensive equipment to filter sulfur dioxide from their emissions. These new plants could save money by installing instead less expensive cleaning equipment that chemically removes most sulfur from coal before combustion.

Which of the following, if known, would be most relevant to evaluating the claim above about how new coal-burning plants could save money?

Whether existing oil-burning plants are required to filter sulfur dioxide from their emissions
Whether the expense of installing the cleaning equipment in a new plant is less than the expense of installing the cleaning equipment in an older plant
Whether the process of cleaning the coal is more expensive than the process of filtering the emissions
Whether lawful emissions of sulfur dioxide from coal-burning plants are damaging the environment
Whether existing plants that use the filtering equipment could replace this equipment with the cleaning equipment and still compete with new plants that install the cleaning equipment

答案是C不明白。感觉A\B\也可以，求解？

作者: gonghao 时间: 2007-5-6 22:55

A out of scope which just focus on coal-burning factory

B expense of installing could have less influence on the money saved by the outcomes drive from not breaking the environement protection law themselves.

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