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医疗器械产品的分类依据是（）。 根据《票据法》，汇票上必须记载的事项包括（）等内容。 ["确定的金额","汇票日期","付款人名称","汇票编号"] You are developing a Windows Communication Foundation (WCF) service.You enable message logging, trace listeners, activity propagation, and tracing on the trace sources.You have the following code segment in the client application. (Line numbers are included for reference only.) 01 Guid multiCallActivityId = Guid.NewGuid(); 02 TraceSource ts = new TraceSource("Multicall"); 03 Trace.CorrelationManager.ActivityId = multiCallActivityId; 04You encounter errors when your client application consumes the service.You need to ensure that your client application can correlate tracing information with the service. Which code segment should you add at line 04?（） ["","","",""] 在加强设备管理时需要通过（）建立完善的使用制度、建立快速反应的维修体系。 ["完善设备采购制度","正确定置设备","完善设备租赁制度","定期设备更新"] 授予一次发明或者实用新型专利的条件包括（）。 ["美观性","新颖性","创造性","实用性"] 声调