You are developing a Windows Communication Foundation (WCF) service. The service needs to access out-of-process resources.You need to ensure that the service accesses these resources on behalf of the originating caller. What should you do?（） [" Set the value of ServiceSecurityContext.Current.WindowsIdentity.ImpersonationLevel to TokenlmpersonationLevel.Impersonation"," Set the value of ServiceSecurityContext.Current.Windowsldentity.ImpersonationLevel to TokenlmpersonationLevel.Delegation"," Set the PrincipalPermissionAttribute on the service contract and update the binding attribute in the endpoint element of the configuration file to wsHttpBinding"," Set the PnncipalPermissionAttribute on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to wsHttpBinding"]
形式意义上的婚姻家庭法
主张恪守戏剧创作的“三一律”的原则的创作方法是（） ["古典主义","人文主义","浪漫主义","现实主义"]
把文学创作当成一种科学活动，要求纯客观再现生活的文学思潮是（） ["现实主义","批判现实主义","自然主义","浪漫主义"]
工程造价控制的关键环节是在于（）。 ["投资决策阶段","工程设计阶段","建设准备阶段","施工组织设计阶段"]
教育现场观察有哪些利弊？
