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标题: 一道GWD题~ [打印本页]

作者: Jennifer789 时间: 2010-2-13 09:48
标题: 一道GWD题~

2. GWD-27-Q2:

Electronic computer chips made of tiny silicon wafers now regularly contain millions of electronic switches.Unfortunately, electronic switches that are this small cannot withstand intense radiation.Micro-Mechanics plans to produce a chip that, because it uses only microscopic mechanical switches, will be invulnerable to radiation damage.The switches will, however, be slower than electronic switches and the chip will contain only 12,000 switches.

For there to be a market for Micro-Mechanics’ chip as a result of the apparent advantage described above, each of the following would have to be true EXCEPT:

A.There will be applications in which the speed attainable by an electronic switch is not essential.

B.Switches used on electronic chips that contain only 12,000 switches are more vulnerable to radiation damage than the switches on Micro-Mechanics’ chip will be.

C.There will be applications for computer chips in environments where the chips may have to survive intense radiation.

D.Some devices in which computer chips will be used will have other components that will be able to function during or after exposure to radiation.

E.Manufacturers are able to protect electronic computer chips against exposure to intense radiation, where this protection is necessary.

答案是E没有错可是想知道为什么D是错的感觉表达的意思跟E是类似的呀谢谢~~

作者: hughlv 时间: 2010-2-13 23:51
D和E还是有非常不同的含义的。

D: 在有辐射的环境中，除了chip以外的其它部件都可以正常工作。 --- 所以只需要把chip换成一个不怕辐射的类型那么这机器就能在辐射环境中正常工作了，否则如果有其它一个部件出问题的话只解决chip问题是不够的。即chip问题应该是辐射环境中需要解决的唯一问题。

E: 制造商有能力将chip进行辐射隔离（比如在外面罩个铅盒）。如果这样的话mechanic switch的chip就没有任何优势了。

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