题目内容
An extranet is a private network that facilitate interaction between businesses. But an extranet requires （) and （).
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If you don’t know exactly where to find the information, you may use one of the many search engines on the Web. （)
Business－to－Business electronic commerce could also change the relationships among different groups of companies in the supply chain. （)
The basic categories of business models include（).
根据《密码法》的规定，下列哪些密码用于保护国家秘密信息？（)
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