网站简介:StackOverflow:面向编程人员问答网是全球IT界最受欢迎的技术问答网站之一,它将一个乏味无趣的技术类问答网站办得如同网游一样令人着迷。
网站简介:Ask questions and get answers from other people in the community.
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网站简介:A directory of subjects with volunteer experts to answer posted questions.
网站简介:Questions and answers in a shared, wiki format.
网站简介:Provides experts via chat, video, or email.
网站简介:Ask an expert or share answers. Features questions and discussions on diverse topics.
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网站简介:Ask questions and check out the archives, organized by topic.
网站简介:Browse archives of previous questions and answers, or submit a question to be answered by astronomers at Cornell University.
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网站简介:Email math questions to a panel of consultants.
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网站简介:An online reference service (via email) from the Library of Congress. Live chat available for certain subject areas.