一道逻辑题，求解。。。

timohuuUID：3213764

The essential condition for the decay of the vacuum is the presence of an intense electric field. As a result of the decay of the vacuum, the space permeated by such a field can be said to acquire an electric charge, and it can be called a charged vacuum. The particles that materialize in the space make the charge manifest. An electric field of sufficient intensity to create a charged vacuum is likely to be found in only one place: in the immediate vicinity of a superheavy atomic nucleus, one with about twice as many protons as the heaviest natural nuclei known. A nucleus that large cannot be stable, but it might be possible to assemble one next to a vacuum for long enough to observe the decay of the vacuum.


7. The author‘s assertions concerning the conditions
that lead to the decay of the vacuum would be
most weakened if which of the following occurred?
(A) Scientists created an electric field next to a
vacuum, but found that the electric field was
not intense enough to create a charged
vacuum.
(B) Scientists assembled a superheavy atomic
nucleus next to a vacuum, but found that no
virtual particles were created in the vacuum‘s
region of space.
(C) Scientists assembled a superheavy atomic
nucleus next to a vacuum, but found that
they could not then detect any real particles
in the vacuum‘s region of space。
(D)Scientists introduced a virtual electron and a
virtual positron into a vacuum‘s region of
space, but found that the vacuum did not
then fluctuate.
(E) Scientists introduced a real electron and a real
positron into a vacuum‘s region of space, but
found that the total energy of the space
increased by the energy equivalent of the
mass of the particles.
是36套上的第35套的第七题，答案是C，我也选对了，但是后来仔细做的时候发现自己是蒙对的，对这个问题一知半解，还有这个题的core argument是The essential condition for the decay of the vacuum is the presence of an intense electric field.也即是强调the presence of an intense electric field，所以我据此认为A是对的，求解答啊/////

crazyrobinUID：2368627

这题都没有core argument，就是说某一个条件是这个decay vacuum出现的必须条件，这个条件是 electric charge, particles that materialize in the space可以产生这种charge效果。下面都是解释这个 particles是怎么产生的 blah blah blah
相比A，C更有说服力，也就是连最基础的particles都没有，就更不会有charged vacuum了，A只是表面上说明了electric field不够强烈，但是很有可能这只是特例，或者particles还不够多来产生这种charged效果。

timohuuUID：3213764

crazyrobin 发表于 2013-4-8 23:13
这题都没有core argument，就是说某一个条件是这个decay vacuum出现的必须条件，这个条件是 electric charg ...

好吧，我搞错了，这个是我自己把题意理解错了。。。谢了crabin。。。。

stingo1993UID：3589336

decay of vacuum需要附近有 heavy atomic nucleus产生的intense electric field作为必要条件，另外particles 可以让decay of vacuum效果manifest显示出来，从而被检测到。
A选项有electric field 但是不够intense所有没有decay of the vacuum,所以符合原文逻辑。
C选项有heavy atomic nucleus但是没有检测到任何particals。原文逻辑没有particles就无法检测decay of the vacuum，但是有heavy atomic nucleus时应该能够检测到decay of vacuum，矛盾。所以选C。