题目内容
A parallelization policy indicates that all Web crawlers can work together without any conflicts.
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Large search engines can index 80% of the current size of the Web.
It's not difficult for a crawler to download the most relevant pages.
Designing a good selection policy cannot work with partial information.
During crawling, a crawler cannot get to know the complete set of Web pages, therefore it cannot design a good selection policy either.
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