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论述降低弦槌硬度的方法。

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爸爸一直在娄底某基层单位上班。这月月底就要办理退休了。请问爸爸办理退休后，如何申领养老保险待遇，领取养老金？

加强生态文明教育应（）

A. 普遍开展生态文明教育，以节约资源和保护环境为主要内容，引导学生养成勤俭节约、低碳环保的行为习惯，形成健康文明的生活方式。
B. 深入推进节粮节水节电活动，持续开展“光盘行动”。
C. 加强大气、土地、水、粮食等资源的基本国情教育，组织学生开展调查体验活动，参与环境保护宣传，使他们认识到环境污染的危害性，增强保护环境的自觉性。
D. 加强海洋知识和海洋生态保护宣传教育，引导学生树立现代海洋观念。

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当前，HSDPA的单小区最高速率可以达到（）

A. 14Mbps
B. 7.2Mbps
C. 14.4M

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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.
B. 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.
D. 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.

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