[求助]关于BF问题，急问！~~~~~~~~~~~

njzww

下载了NN关于BF问题的总结，可是只见题目不见解释，实在看不明白。即使抱着答案看也仍然不得其法。快考试了，感觉BF在新题中的分量很重，请问大侠，我该怎样准备BF啊？救救我吧，实在没辙了~~~我的逻辑最差了55555555555555555

mindfree

Why don't you post some questions and we can analyze them for you. Please also post your reasoning so others can tell what went wrong.

valarie

BF 是什么？