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[求助]取非是什么意思?

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楼主
发表于 2008-10-30 11:38:00 | 只看该作者

[求助]取非是什么意思?

最近看到大牛的笔记 有种方法叫取非?

那到底什么样才叫取非?

具体怎么做法?

沙发
发表于 2008-10-30 14:27:00 | 只看该作者
对条件改成否命题,套入原文,去看结论是否被削弱/增强。
比如assumption,那么正确的assumption一但被取非之后,结论是被削弱的(bridge没有了,或者造成没有因果,因果相反,他因解释,等等)证明该选项是assumption

再如weaken题,正确的削弱条件,在被取非之后,不但没法weaken,反而加强了结论。

不知道总结的对不对,或者还有没有其他取非scenario的,望NN给予补充
板凳
发表于 2008-11-1 07:01:00 | 只看该作者

这是我昨天刚问过的题,就是一个挺典型的取非,希望能给你提供一个列子。但实际上我也是不知道什么取非,总是在哪里冥思苦想,百思不得其解。

68.        (35185-!-item-!-188;#058&007601)

Manufacturers sometimes discount the price of a product to retailers for a promotion period when the product is advertised to consumers.  Such promotions often result in a dramatic increase in amount of product sold by the manufacturers to retailers.  Nevertheless, the manufacturers could often make more profit by not holding the promotions.

Which of the following, if true, most strongly supports the claim above about the manufacturers' profit?

Which of the following, if true, most strongly supports the claim above about the manufacturers' profit?

(A) The amount of discount generally offered by manufacturers to retailers is carefully calculated to represent the minimum needed to draw consumers' attention to the product.

(A) The amount of discount generally offered by manufacturers to retailers is carefully calculated to represent the minimum needed to draw consumers' attention to the product.

(B) For many consumer products the period of advertising discounted prices to consumers is about a week, not sufficiently long for consumers to become used to the sale price.

(C) For products that are not newly introduced, the purpose of such promotions is to keep the products in the minds of consumers and to attract consumers who are currently using competing products.

(D) During such a promotion retailers tend to accumulate in their warehouses inventory bought at discount; they then sell much of it later at their regular price.

(E) If a manufacturer fails to offer such promotions but its competitor offers them, that competitor will tend to attract consumers away from the manufacturer's product.

答案是D. 是答案错了吗?我是管销售的,如果我低价卖出去东西,而RETAILER又囤积货物,那我岂不是很长时间都卖不东西了,哪来的利润呀?

大N给的解释:

D,  实际上是个假设支持,也就是说正因为零售商的囤积促销期大量买入产品的恶心行为,才会导致生产商赚的钱不多,所以结论说,他们只有按非打折价格出售产品才会赚更多的钱。

把D 取非就成了削弱了


[此贴子已经被作者于2008-11-1 7:02:15编辑过]
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