简述四拍子的特点。
信息化工程按照国家信息技术管理标准体系定义的全生命周期，划分为规划阶段、设计阶段、建设阶段、运维阶段、管理阶段、治理阶段。
个性化策略中知识管理的主要目的是（） ["使知识可以被大规模同时学习","为客户提供需要显性知识的个性化服务","协助具有隐形知识的人与他人进行知识的交流和共享","知识保存"]
建设工程项目开工前，工程质量监督的申报手续应由项目（）负责。 ["建设单位","施工企业","监理单位","设计单位"]
You are the network administrator for . The network consists of a single Active Directory domain named All network servers run Windows Server 2003. Some client computers run Windows 2000 Professional, and the rest run Windows XP Professional. All user accounts in the Sales department are located in the Sales organizational unit (OU). To store roaming user profiles, you create a shared folder named Profiles on a member server named TK1. You assign the Allow - Full Control permission on the Profiles folder to the Everyone group. Now you need to create roaming user profiles for the user accounts in the Sales OU. What should you do?（） [" Select all user accounts in the Sales OU. Modify the account properties to specify \\\\TK1\\Profiles\\%username% as the profile path."," Select all user accounts in the Sales OU. Modify the account properties to specify \\\\TK1\\Profiles as the profile path."," Create a Group Policy object (GPO) and link it to the Sales OU. In the User Configuration section of the GPO, configure Folder Redirection to use \\\\TK1\\Profiles."," Create a Group Policy object (GPO) and link to the Domain Controllers OU. In the User Configuration section of the GPO, configure Folder Redirection to use \\\\TK1\\Profiles."]
试述磷对焊缝的危害性？ 磷是钢和焊缝中的有害元素，磷使钢材强度、韧性增加、塑性和韧性降低，特别会减少钢材的低温韧性，也就是导致钢的“冷脆性”，磷还造成钢材的偏析，即在回火过程中，磷偏析于晶界，从而引起钢材的回火脆性，这在Cr--Mo钢中特别常见。 磷在焊缝中，同样也降低其冲击韧性并使脆性转变温度 升高。而且也会促发热裂纹。 为减少焊缝中的磷含量，一可以通过控制母材和焊接材 料特别是焊剂中的磷含量，二可以通过治金反应脱磷，如增加渣中CaO和FeO的含量，可以减少焊缝的含磷量。
