列国时代
You are developing a client application that consumes a Windows Communication Foundation (WCF) service. You use the svcutil.exe utility to create a proxy for the service. You use the svcutil.exe switches that generate asynchronous calls. GetFlight is a service operation that takes no parameters and returns a string. The GetFlightCallback method must be called when the service operation returns.You create an instance of the client proxy with the following code:var client = new TranvelServiceClient();You need to ensure that a callback is received when the GetFlight operation is called asynchronously. Which code segment should you use?（） [" client.BeginGetFlight(GetFlightCallback, null); client.GetFlight();"," client.GetFlight(); client.BeginGetFlight(GetFlightCallback, null);"," client.GetFlightCompleted += new EventHandler(GetFlightCallback); client.GetFlightAsync();"," IAsyncResult asyncResult = client.BeginGetFlight(GetFlightCallback, client); client.EndGetFlight(asyncResult); <\/getflightcompletedeventargs>"]
冷锋
土壤团聚体的形成过程及其土壤肥力学意义。
从事医疗器械批发业务的企业，其（）、（）、（）等记录应当符合可追溯要求。
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