GWD31-16 ~~一道没想明白的题

loverwy

GWD31-16

16: In recent years, networks of fiber-optic cable have been replacing electrical wire for transmitting telecommunications signals. Signals running through fiber-optic cables deteriorate, and so the signals must be run through a piece of equipment called a regenerator before being transmitted father. Light-Line is the leading manufacturer of signal regenerators. Therefore, Light-line is one of the companies that will most benefit if new long-distance fiber-optic telecommunications networks are constructed.



Which of the following, if true, casts the most doubt on the prediction about light-ling’s prospects?



A: Telecommunications signals sent along electrical wires can travel much farther than signals transmitted through fiber-optic before needing to be regenerated.



B: Expanding its production of regenerators will require Light-line to spend proportionately more on labor and materials.



C: The volume of signals that a fiber-optic cable can carry is several thousand times greater than the volume that can be carried by an electrical wire of similar size.



D: There are technologies that enable telecommunications signals to be transmitted without either wire or fiber-optic cable.



E: Several manufacturers are developing regenerator technologies that will allow signals to be transmitted many times farther than at present before requiring regeneration.

答案选E.

看了很多网友评论说E表明新技术出现后，就不在需要regenerator. 请大家再仔细看下E，说的是Several manufacturers are developing regenerator technologies that 。。。。 before requiring regeneration. 就说明还是需要regenerator了。

我选的是D，因为新技术出现后，可能就不需要regenerator了。有网友评论说，这个答案在质疑原文中的事实。可是题目说的就是“Which of the following, if true,。。。 ”，"if true" 就说明应该可以质疑原文中提到的观点。还请NN解答

Luxe

关键原文明确说明了 if new long-distance fiber-optic telecommunications networks ，要建的是一个光纤骨干网。

loverwy

谢谢楼上的回复。可以进一步解释为什么E对吗？如果仍旧需要regenerator的话。

Catherine0301

文章的意思是因为需要regenerator所以light-line会更受益，然而E选项说signal可以传得更远，也就是说使得L受益的R数量减少了，也就是抵消了文中的使L受益的原因。

hanshipeng

D选项--无关选项，技术的提高带来的不使用光纤和普通电缆。但是体面问题假设是如果扩大光纤的使用。所以就不用考虑如上的问题了。所以是无关的。E选项，削弱。大批量的光线工程一定能带来光纤的使用量。按照原来的技术，对generator需求会增加，从而对企业有利。 但是这里一些企业能是单位距离的光纤对generator的需求减少。从而，虽然光纤使用增加，并不一定带来对generator的需求增加。所以削弱。为正解。

坤kun

突然有想法，不知道对不对~

前提：信号会在传输过程中被减弱，所以如果传输距离很远的话，需要regenerator来不断重建信号。
结论：作为生产regenerator行业的龙头老大，如果大面积建造这种远距离光纤的话，LL公司会获益很大。

D只是说有一种新技术可以让信号传输without either wire or fiber-optic cable，但是难道这样就不会造成信号削弱的问题吗？我们整个题讨论的背景都是在为了解决信号减弱问题，如果你这项新技术仍然会带来信号削弱问题，那还是要regenerator，还是会导致LL获益，所以D并不确定能不能削弱结论。

看E，allow signals to be transmitted many times ，many times很重要，如果新技术可以让信号自己就完成多次发送，那当然就不需要regenerator，因而也就不会给LL带来收益，削弱！

欢迎讨论哈~~

渔夫summer

E allow signals to be transmitted many times farther than at present before requiring regeneration.

感觉这句话的意思是说信号传输的更远，以至于不需要regeneration了，所以对LL公司不利，不知道这样理解对不对。。。。。

sdcar2010

transmitted many times

transmitted many times farther

These are two difference things!

坤kun

transmitted many times

transmitted many times farther

These are two difference things!

-- by 会员 sdcar2010 (2011/5/24 11:23:44)

Yes! I think I'm wrong. many times is just a phrase used to modify farther. But the meaning  I want to express is still the same. If the new technology could prevent signals from deteriorating without the regenerator, the LL company would not benefit from the program. Right?

蓝山六六

坤kun 发表于 2011-5-24 12:33
transmitted many timestransmitted many times fartherThese are two difference things!-- by 会员 sd ...

But the new technology is a kind of  regenerator technology, so they still have to use regenerator, right? So that u said "prevent signals from deteriorating without the regenerator" is wrong. We can't do this without regenerator  and what the argument mentioned is a new regenerator technology. How to explain this?