sec１３－１２想了好几天，非常感谢！！再问因果型削弱和充分必要型削弱！！

amber0919

我再顶．

amber0919

谢谢lawyerGG. 您说137A里没有说"导致",并没有因果关系.构成不了削弱．可是您看下一题

198.

A factory was trying out a new process for producing one of its products, with the goal of reducing production costs. A trial production run using the new process showed a 15 percent reduction in costs compared with past performance using the standard process. The production managers therefore concluded that the new process did produce a cost savings.

Which of the following, if true, casts most doubt on the production manager’s conclusion?

(A) In the cost reduction project that eventually led to the trial of the new process, production managers had initially been seeking cost reductions of 50 percent.

(B) Analysis of the trial of the new process showed that the cost reduction during the trial was entirely attributable to a reduction in the number of finished products rejected by quality control.

(C) While the trial was being conducted, production costs at the factory for a similar product, produced without benefit of the new process, also showed a 15 percent reduction.

(D) Although some of the factory’s managers have been arguing that the product is outdated and ought to be redesigned, the use of the new production process does not involve any changes in the finished product. 　　（Ｃ）

(E) Since the new process differs from the standard process only in the way in which the stage of production are organized and ordered, the cost of the materials used in the product is the same in both processes.

Ｃ里也没有明确的说因果关系呀．为什么可以够成削弱呢？　是不是在与结论的不同，１３７说can　１９８说did produce　也就是说１３７题的can说明并没有排除它因．所以Ａ里的same patterns也可以构成破坏婚姻的条件．也就应了ＯＧ的解释：

The argument does not depend on there being only one cause of marital problems, so choice A is incorrect.

是这样吗？可是感觉对结论的用词是很难把握．

不太明白了。还请lawyerＧＧ指点．．偶天生愚昧，老是不弄不明白．麻烦您了！！谢谢．．

lawyer_1

请细看我20楼的话。