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标题: GWD31-16 ~~一道没想明白的题 [打印本页]

作者: loverwy 时间: 2010-7-23 17:28
标题: GWD31-16 ~~一道没想明白的题
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

作者: Luxe 时间: 2010-7-23 17:37
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。

作者: loverwy 时间: 2010-7-23 17:46
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。

作者: Catherine0301 时间: 2011-5-8 19:40
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。

作者: hanshipeng 时间: 2011-5-8 21:05
标题: try
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。

作者: 坤kun 时间: 2011-5-24 10:52
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~~

作者: 渔夫summer 时间: 2011-5-24 11:16
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。。。。。

作者: sdcar2010 时间: 2011-5-24 11:23
transmitted many times

transmitted many times farther

These are two difference things!

作者: 坤kun 时间: 2011-5-24 12:33

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?

作者: 蓝山六六 时间: 2014-7-1 11:44

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?

作者: 烂烂家的芸 时间: 2014-10-8 23:16
E: Several manufacturers are developing regenerator technologies that will allow signals to be transmitted many times farther than at present before requiring regeneration.

我觉得这句话的意思应该是：几家制造商都在发展转化器的科技---可以允许信号传播的比现在在转换器之前的传播更远几倍。

那么当然削弱啊，结论是说Therefore, Light-line is one of the companies that will most benefit if new long-distance fiber-optic telecommunications networks are constructed.

有几家公司可以发展不要转换器就更远那还要转换器干嘛？就算最后还是需要转换器，因为这种尝试不要转换器，LL公司也不可能最受益啊。

我是这么理解的。

作者: Akiii 时间: 2018-9-21 20:55

蓝山六六发表于 2014-7-1 11:44
But the new technology is a kind of regenerator technology, so they still have to use regenerator ...

Yeah we still need the regenerator, but the 'regeneration' frequency can be reduced.
That's what E said.
For example, at present, before requiring regeneration , the signal can travel 100m, then it can travel another 100m once the regeneration is made. So if the signal is going through a 1000m fiber-line, it will be regenerated 9 times.
The new technology, however, can make the signal travel 500m before the first regeneration. And after the first regeneration, it can travel another 500m. Thus, to pass through a 1000m fiber-line, it only takes regeneration once.
As a result, even the fiber-line is longer than now, the demand for regenerator will not increase thanks to the anvanced techonology.
Imagine you are running a 1000m race. When you were weak, you had to drink 9 bottles of water. Now you become so strong that even you are running a 5000m race, you just need to drink 5 bottles of water.
So people who sell water to you will not make more money on you.

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