农业在经济发展中的作用是什么？
You are creating a Windows Communication Foundation (WCF) service that accepts messages from clients when they are started. The message is defined as follows:[MessageContract] public class Agent { public string CodeName { get; set; } public string SecretHandshake { get; set; }}You have the following requirements: The CodeName property must be sent in clear text. The service must be able to verify that the property value was not changed after being sent by the client. The SecretHandshake property must not be sent in clear text and must be readable by the service.What should you do?（） [" Add a MessageBodyMember attribute to the CodeName property and set the ProtectionLevel to Sign. Add a MessageBodyMember attribute to the SecretHandshake property and set the ProtectionLevel to EncryptAndSign."," Add a DataProtectionPermission attribute to the each property and set the ProtectData property to true."," Add an xmlText attribute to the CodeName property and set the DataType property to Signed. Add a PasswordPropertyText attribute to the SecretHandshake property and set its value to true."," Add an ImmutableObject attribute to the CodeName property and set its value property to true. Add a Browsable attribute to the SecretHandshake property and set its value to false."]
导水机构安装主要技术要求有哪些？
构成数据流图的主要成分有哪些？
Certkiller。COM网络由一个单一的Active Directory域。森林的功能级别是Windows Server 2008。您需要在您的域中的用户创建多个密码策略。你应该怎么做呢（） ["从“ADSI编辑”管理单元，创建多个密码设置对象。","从组策略管理单元中，创建多个组策略对象。","从架构管理单元，创建多个类架构对象。","从安全配置向导，创建多个安全政策。"]
什么是IP子网，请简述IP子网划分的作用 。
