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标题: PREP08 CR02-82 [打印本页]

作者: ruirui_hsu    时间: 2011-6-26 19:57
标题: PREP08 CR02-82
82.    (33511-!-item-!-188;#058&007598)

Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade.  However, the thresholdofeconomicviability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars.
Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its thresholdofeconomicviability?
A. The cost of oil has fallen dramatically.
B. The reduction in the cost of solar-power equipment has occurred despite increased raw material costs for that equipment.
C. Technological changes have increased the efficiency of oil-fired power plants.
D. Most electricity is generated by coal-fired or nuclear, rather than oil-fired, power plants.
E. When the price of oil increases, reserves of oil not previously worth exploiting become economically viable.

(that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants)
谁能把这个句子给我分析下。我这个句子是在是没看懂到底是啥意思。
作者: sdcar2010    时间: 2011-6-26 20:15
the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants)

This sentence in parentheses is a definition of the threshold of economic viability.  So the threshold is the price per barrel for oil which has to be reached when the new solar power plant can become more economical than the new oil-fired power plant.
作者: ruirui_hsu    时间: 2011-6-26 20:22
the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants)

These sentence in parentheses is a definition of the threshold of economic viability.  So the threshold is the price per barrel for oil which has to be reached when the new solar power plant can become more economical than the new oil-fired power plant.
-- by 会员 sdcar2010 (2011/6/26 20:15:57)



Ahhhh~~ cool guy!
That is, 为了使Solar Power Plant更加economical, 每桶油价需要上调。

另外,还有,关于这个threshold 的问题。threshold= solar efficiency- oil fire effiency? 这个理解起来有点困难。
作者: ruirui_hsu    时间: 2011-6-26 21:14
关于这个threshold我觉得还是没明白。虽然括号里解释了关于economic viability的定义。
看到一个解释说:是因为ratio of solar vs oil-fired plant 的比值不变,所以threshold也unchanged. 但是不懂。不知道原文是怎么推到的。
作者: sdcar2010    时间: 2011-6-26 21:20
Threshold is a benchmark. Above this benchmark, the new solar power plant is more economical than the new oil-fired power plant. At this mark, they are the same. Below it, the new oil-fired power plant is more economical.
作者: ruirui_hsu    时间: 2011-6-26 21:38
how did you get this? just from the original text?
作者: sdcar2010    时间: 2011-6-26 21:41
Here:
that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants
作者: ruirui_hsu    时间: 2011-6-26 21:45
Ok. Thats the point i cannot fully understand, so i miss the key information for solving this question.

Oh, god. CR is really difficult.... what and how can i do next!!
作者: garlicwu    时间: 2011-7-29 03:09
看了半天才搞明白这道题

题目的关键是对 threshold of economic iability 的定义,括号中意思是说要想太阳能电厂比油电厂效益高,每桶油的价格必须达到一个值,这也是为什么 threshold of economic liability用$35表示的原因,应该是指每桶油35块

举例说,太阳能电厂发100度电需要35块,油电厂发100度电需要一桶油,要想太阳能电厂效率高,每桶油价格就不能低于35块。这就是threshold,娘的,好晕呀

现在题目说太阳能电厂效率提高了,35块可以发120度电了,但是要想比油电厂效率高,每桶油还得35块,为什么?

油电厂说我效率也提高了,我现在一桶油可以发120度电了,靠,同样发120度电,你太阳能电厂凭什么比我效率高?所以太阳能电厂无赖了,妈的我要比你效率高,你每桶油就是不能低于35,这就是他娘的我的threshold

所以答案 C 出来了,我也晕死了
作者: fanaf821    时间: 2011-8-11 10:40
哈哈 谢谢楼上 非常形象生动 funny exlanation
作者: AlohaDJ    时间: 2011-8-15 01:53
哈哈 谢谢8楼童鞋~~
作者: briarbaby    时间: 2011-11-8 14:39
8楼的评论太生动了~
作者: deutsch6cfhsxx    时间: 2011-12-14 16:43
8楼头像也很形象的说~
作者: 大三准备留学    时间: 2011-12-19 15:14
8楼大牛哈 犀利的评说
作者: luweitong    时间: 2012-10-8 15:31
thanks a lot
作者: riclyme    时间: 2012-10-16 00:58
哈哈,生动解释~
作者: 超人小猪猪    时间: 2012-10-17 11:15
楼上的楼上的神解!!GOOD!!!
作者: veronicazlx    时间: 2013-8-4 12:41
8楼解释还是不懂。因为如果A选项油价下跌了。那么现在35块能买1.2桶油了。就算效率没变高,也能发120度电,也解释了threshold没变啊
作者: 微微爱    时间: 2013-8-15 20:55
看了解释。。。终于懂了。。。干。。考试要出这么绕 要死啊。。
作者: 晓野的野    时间: 2013-10-3 16:18
garlicwu 发表于 2011-7-29 03:09
看了半天才搞明白这道题题目的关键是对 threshold of economic iability 的定义,括号中意思是说要想太阳能 ...

又看了一遍 又笑了一遍
作者: Victoriagirl    时间: 2014-3-7 16:28
garlicwu 发表于 2011-7-29 03:09
看了半天才搞明白这道题题目的关键是对 threshold of economic iability 的定义,括号中意思是说要想太阳能 ...

哈哈  解释的好欢乐啊   赞一个
作者: brfmzbjz    时间: 2014-5-14 21:49
veronicazlx 发表于 2013-8-4 12:41
8楼解释还是不懂。因为如果A选项油价下跌了。那么现在35块能买1.2桶油了。就算效率没变高,也能发120度电, ...

8楼有地方没说清楚,我想了很久,终于想通,供参考一下。

文章里那个threshold 的意思是说,在制造同样电力的情况下,太阳能发电的成本比使用35元/桶油价的油电厂的成本要低(economical),写成公式也就是

100度电太阳能厂的cost 小于等于 100度电油电厂的cost= threshold(油的价格) * 用油量 (此处threshold已经10年保持在35元,在35元的时候,两边的cost相等)

现在,100度电太阳能厂的cost下降的(由于technological improvement)
所以100度电油电厂cost也应该下降。也就是说,要么threshold下降了,要么用油量下降了。
由于题目告诉我们了,threshold保持了10年不变,都是35元,所以只剩用油量下降这个选择了,也就是油电厂的efficiency在提高。

这个threshold的变化从头到尾都跟现在的油价没有任何关系。所以A不对。



作者: alisakwong    时间: 2014-9-18 19:10
要被这题纠结死了。把楼上的解释转化为一个熟悉的例子,希望可以提供点思路。就是:

说A同学的优秀程度是个相对的值,即A的优秀要用B同学每科多考多少分来衡量,假设为35分,即A的优秀程度=B每科要多考35分*科目。

现在A变得更加优秀了,按理来说,衡量的值就是等式中B每天要头悬梁锥刺股,每科要考更多分才能体现出A的优秀了。

很奇怪的是B其实不需要每科多考更多的成绩也能体现出A的优秀。因为B虽然每科还是要多考35,但是他找到了另外一个方法,就是多修了几门课,这样等式依然成立。B用另外一种方式证明A真的更加优秀了。
作者: sunyuwei    时间: 2014-10-11 08:30
brfmzbjz 发表于 2014-5-14 21:49
8楼有地方没说清楚,我想了很久,终于想通,供参考一下。

文章里那个threshold 的意思是说,在制造同样 ...

分析的很好 赞一个
作者: patricialiu    时间: 2014-10-13 10:47
brfmzbjz 发表于 2014-5-14 21:49
8楼有地方没说清楚,我想了很久,终于想通,供参考一下。

文章里那个threshold 的意思是说,在制造同样 ...

to the point! up!
作者: GiannaLiu    时间: 2017-9-3 09:17
garlicwu 发表于 2011-7-29 03:09
看了半天才搞明白这道题题目的关键是对 threshold of economic iability 的定义,括号中意思是说要想太阳能 ...

同意!               
作者: Etoile-    时间: 2017-11-2 19:24
brfmzbjz 发表于 2014-5-14 21:49
8楼有地方没说清楚,我想了很久,终于想通,供参考一下。

文章里那个threshold 的意思是说,在制造同样 ...

两楼结合看,豁然开朗!!!!
作者: 梦季    时间: 2018-5-23 13:30
看一下!               
作者: Charline_chang    时间: 2019-6-17 10:18
garlicwu 发表于 2011-7-29 03:09
看了半天才搞明白这道题题目的关键是对 threshold of economic iability 的定义,括号中意思是说要想太阳能 ...

同意! 楼上解释通俗易懂,太厉害了懂了!
作者: Charline_chang    时间: 2019-6-17 10:20
brfmzbjz 发表于 2014-5-14 21:49
8楼有地方没说清楚,我想了很久,终于想通,供参考一下。

文章里那个threshold 的意思是说,在制造同样 ...

同意!               赞!!!




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