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?
A. Whether existing oil-burning plants are required to filter sulfur dioxide from their emissions.
B. 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.
C. Whether the process of cleaning the coal is more expensive than the process of filtering the emissions
D. Whether lawful emissions of sulfur dioxide form coal-burning plants are damaging the environment.
E. Whether existing plants that use the filtering equipment could replace this equipment with the cleaning equipment and still complete with new plants that install the cleaning equipment.
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?
注意读题: 结论在问题里面已经告诉你了,how new-coal burning plants could save money
看提干: new equp: expensive filter SO2 after burned
old equp: cheap filter S before burned
目的: To save money
评价: 是否new equp可以节省money
new equp 的安装费已经比old equp贵了作者: labixiaoxinyue 时间: 2012-9-20 06:10
total cost= equipment cost(fix cost) + operation cost (process cost)
from the stimulus we know cleaning equipment is less expensive than filter euipment,
thus, to evaluate the the total cost saving between two technologies is to check the process cost gap between two methods.
that is what C is talking about.
C. Whether the process of cleaning the coal is more expensive than the process of filtering the emissions作者: cindytaurus 时间: 2012-10-6 06:22
我只是不懂These new plants could save money by installing instead less expensive cleaning equipment that chemically removes most sulfur from coal before combustion.
这句话中的instead是什么意思。。。
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