[填空题] 国家对医疗器械实行分类管理，第三类是指具有（），需要采取特别措施严格控制管理以保证其安全、有效的医疗器械。

You are developing a Windows Communication Foundation (WCF) service to provide an in-memory cache for many Web applications.The service contract is defined as follows. (Line numbers are included for reference only.) 01 [ServiceContract] 02 public interface IDataCache 03 { 04 ... 05 }06 07 08 public class DataCache : IDataCache 09 { 10 ... 11 } You need to ensure that all users share the cache. Which code segment should you insert at line 07?（） [" [ServiceBehavior(TransactionIsolationLevel = IsolationLevel.RepeatableRead)]"," [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]"," [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]"," [ServiceBehavior(TransactionIsolationLevel = IsolationLevel.ReadComitted)]"] 根据《固定式压力容器安全技术监察规程》，压力容器所选用的压力表，其表盘直径不得小于（）。 ["100mm","150mm","200mm","250mm"] 什么是系统？系统的主要特征有哪些？ 在国际贸易中，常见的计重方法有（）。 ["毛重","净重","公量","理论重量和法定重量"] 消毒是指杀灭病原微生物或者有害微生物，将其数量减少到无害化程度的过程。 国家对医疗器械实行分类管理，第三类是指具有（），需要采取特别措施严格控制管理以保证其安全、有效的医疗器械。