There is a set of Web pages identified as interested or uninterested for the user that can be used t

There is a set of Web pages identified as interested or uninterested for the user that can be used to solve Web pages filtering problem by machine learning, select which of the following element/feature is the formal definition for those Web pages.有一组供用户标识为感兴趣或不感兴趣的网页，可被机器学习用来解决网页过滤问题，选择下列特征中哪个是通过训练这些网页学来的？

A.Task (T)任务

B.Performance (P)性能

C.Experience (E)经验

D.Examples (E)样本

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