题目内容
Combinations of HTTP GET (URL-based)parameters can produce different URLS, all of which may be linked on the site.
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A crawler must crawl the Web in a scalable and efficient way because the bandwidth is neither infinite not free.
A Web crawler should follow a combination of four policies, namely selection, revisit, politeness and parallelization.
A parallelization policy indicates that all Web crawlers can work together without any conflicts.
Large search engines can index 80% of the current size of the Web.
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