Online databases can be impossible for search engine spiders to crawl since they usually require passwords or subscriptions.
Correct Answer:
Verified
Q26: The University of Michigan Documents Center provides
Q27: The deep Web may be up to
Q28: Newsgroups are virtual bulletin boards where messages
Q29: Intelligent search agents like only search the
Q30: FirstGov is an example of a comprehensive
Q32: MagPortal.com and FindArticles allow you to search
Q33: Intelligent search agents can query multiple sources
Q34: Listservs are software that support mailing lists.
Q35: There are periodicals that exist only on
Q36: Virtual bulletin boards are also called forums
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