唐宋明清的建筑发展特点概述？
（）确定了与孙中山领导的国民党实行党内合作的政策。 党的三大。 党的一大。 党的四大。 党的二大。
简述矿产学的研究任务？
You are developing a Windows Communication Foundation (WCF) service that returns location information for authorized law enforcement agencies. The service contract is as follows: [ServiceContract] public interface IMappingService { [OperationContract] long[] GetLocationCoordinates(String cityName); [OperationContract] long[] GetLocationOfCitizen(String ssn); } Users are authenticated and impersonated. The system uses ASP.NET roles. The members of law enforcement are members of the LawEnforcement role. You need to ensure that only members of the LawEnforcement role can call these methods. What are two possible ways to achieve this goal?（） (Each correct answer presents a complete solution. Choose two.) Add a PrincipalPermissionAttribute to each method that should be available only to members of law enforcement. Set its SecurityAction to Demand and set the role equal to LawEnforcement.。 Use the CurrentPrincipal property of the thread. Call the IsInRole method specifying LawEnforcement as a parameter.。 Create a GenericPrincipal specifying Thread.CurrentPrincipal.Identity as the IIdentityParameter and LawEnforcement as the only value for the Roles parameter.。 At the beginning of each method, enumerate each ClaimSet in a new WindowsClaimSet. Use the FindClaims method to locate a claim type named Role with a right named LawEnforcement.。
简述霍桑实验的步骤。
在人体细胞内发现的唯一一种具有天然核酶活性的动物病毒是（）
