Traverton's city council wants to minimize the city's average yearly expenditures on its traffi c signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume signifi cantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fi xtures so as to accept LED arrays would be minimal.
Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton's yearly maintenance costs?
Travertons city council wants to minimize the citys average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.
Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Travertons yearly maintenance costs?
(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
(B) Whether any cities have switched from Incandescent lights in their traffic signals to Lighting elements other than LED arrays
(C) Whether the company from which Traverton Currently buys incandescent bulbs for traffic Signals also sells LED arrays
(D) Whether Traverton’s city council plans to increase The number of traffic sights in traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffic Signals know how to convert the existing fixtures so as To accept LED arrays
答案是啊,是属于方案推理吗?
方案推理类
方案:replacing the incandescent bulbs currently in use with arrays of LEDs as the incandescent bulbs burn out.
灯泡坏了换LED
目的: wants to minimize the citys average yearly expenditures on its traffic signal lights
减少灯的开支
四个方向:目的是否正确(稀少),方案是否可行,方案本事能否执行(这个题目讨论的是方案执行后有无效果,即“如果执行”),方案有无其他副作用
即选项必须提到方案内容
选项分析:
(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
提到方案内容,且考虑换灯是否真的可行,正确
(B) Whether any cities have switched from Incandescent lights in their traffic signals to Lighting elements other than LED arrays
提到方案内容,考虑有没有人执行过方案,但是题目讨论的是方案执行后能不能对目的起到效果,去掉
(C) Whether the company from which Traverton Currently buys incandescent bulbs for traffic Signals also sells LED arrays
没与方案无关,方案讲换灯泡,这里变成买灯泡,去掉
(D) Whether Traverton’s city council plans to increase The number of traffic sights in traverton
与方案无关,去掉
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffic Signals know how to convert the existing fixtures so as To accept LED arrays
提到方案内容,但文章已提及换灯成本可忽略不计,去掉