以下是引用mindfree在2003-5-24 3:06:00的发言: 我认为没有D的前提下,E可以算做答案, 因为加强和削弱的范围比较宽, 起一定作用就可以.
请其他人补充. E is not good regardless. You cant say A contributes to a effect because no A the effect is less and with A the effect is more. There could be other factors. This is different from saying A contributes to effect becuase no A less effect, and with A and everything else equal there is more effect, which is a logical conclusion. That's what D is about.
[此贴子已经被作者于2006-8-28 9:23:22编辑过] |