[多选] 下列险种属于特殊附加险的是（）。

You are developing a Windows Communication Foundation (WCF) service.One of the service operations contains the following code.private static int counter = 0;[OperationContract]public void IncrementCount(){ counter++;}You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time. Which code segment should you use to set the service behavior?（） [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Single)]。 [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Single)]。 [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Multiple)]。 [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Reentrant)]。 试述高中生品德发展的基本特征。 医疗器械经营企业应当采取有效措施，确保医疗器械运输、贮存过程符合医疗器械说明书或者标签标示要求，并做好相应记录，保证医疗器械质量安全。 Your network consists of a single Active Directory domain. All domain controllers run Windows Server  2008 R2.  The Audit account management policy setting and Audit directory services access setting are enabled for  the entire domain.  You need to ensure that changes made to Active Directory objects can be logged. The logged changes  must include the old and new values of any attributes.  What should you do（） Enable the Audit account management policy in the Default Domain Controller Policy.。 Run auditpol.exe and then configure the Security settings of the Domain Controllers OU.。 Run auditpol.exe and then enable the Audit directory service access setting in the Default Domain  policy.。 From the Default Domain Controllers policy， enable the Audit directory service access setting and  enable directory service changes.。 建造师执业资格注册有效期一般为（）年 2。 3。 4。 5。 下列险种属于特殊附加险的是（）。