项目投资国民经济效益分析，又叫做项目国民经济效益评估，它是按照资源合理配置的原则，从国家整体角度考察项目的效益和费用，用货物影子价格、影子工资、影子汇率和社会折现率等国民经济评价参数体系，分析、计算投资项目对国民经济的净贡献，从而评价投资项目的经济合理性。
海洋三大环境梯度中赤道到两极的环境梯度主要表现为赤道向两极的太阳辐射强度（），季节差异（），每日（）持续时间不同，从而直接影响（）的季节差异和不同纬度海区的（）模式。
Your network consists of a single Active Directory domain. All domain controllers run Windows Server2008 R2. Your company and an external partner plan to collaborate on a project. The external partner has an Active Directory domain that contains Windows Server 2008 R2 domain controllers. You need to design a collaboration solution that meets the following requirements： èAllows users to prevent sensitive documents from being forwarded to untrusted recipients or from being printed. èAllows users in the external partner organization to access the protected content to which they have been granted rights. èSends all inter-organizational traffic over port 443. èMinimizes the administrative effort required to manage the external users. What should you include in your design？（） ["Establish a federated trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that has Microsoft SharePoint Foundation 2010 installed.","Establish a federated trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that runs Microsoft SharePoint 2010 and that has the Active Directory Rights Management Services （AD？RMS） role installed.","Establish an external forest trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that has the Active Directory Certificate Services server role installed. Implement Encrypting File System （EFS）.","Establish an external forest trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that has the Active Directory Rights Management Service （AD？RMS）role installed and Microsoft SharePoint Foundation 2010 installed."]
文学阅读是读者在特定语境中对文学文本的读解过程。包括四个要素：读者、（）、文学文本、读解。
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在什么情况下需要同时打开多个文档进行操作？
