其中关于服务代码（SERVICE CODE）下面的描述是正确的？（）A、服务代码( Service code)可以帮助客户提取他/她的车辆在非营业时间B、服务代码( Service code)是单独的维修项目C、服务代码( Service code)经车间发出D、服务代码( Service code)描述了保养工作的成本E、服务代码( Service code)可通过仪表读出

You are developing a Windows Communication Foundation (WCF) service. The service operation takes a customer number as the only argument and returns information about the customer. The service requires a security token in the header of the message. You need to create a message contract for the service.Which code segment should you use?（）

A.

B.

C.

D.

DSSS使用一个碎片代码(chipping code)把冗余数据编码到已调制的信号中。下面哪两项是DSSS使用的碎片代码实例?(选择两项)

A、巴克码(Barker code)

B、贝克码(Baker code)

C、补码键控(CCK，Complementary Code Keying)

D、密码块链接(CBC，Cypher Block Chaining)

A．

B．

C．

D．

A.Service是Android四大组件之一

B.没有用户界面

C.在Java代码中可以动态注册服务

D.Service依赖于Activity，当Activity销毁时，Service也被销毁

You are developing a Windows Communication Foundation (WCF) service that is hosted by a Windows Forms Application.The ServiceHost instance is created in the Form Constructor.You need to ensure that the service is not blocked while the UI thread is busy.What should you do?（）

A. Decorate the service implementation class with the following line of code [ServiceBehavior(UseSyncronizationContext = false)]

B. Decorate the service implementation class with the following line of code [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]

C. Call the Invoke method of the form and supply a delegate.

D. Call the BeginInvoke method of the form and supply a delegate.

你得到了开发定期监察在同一台计算机上的其他 Windows 服务的 Windows 服务应用程序的任务。该Windows 服务应用程序还必须登录任何异常的文件系统活动。下面的类添加到 Windows 服务应用程序：（）public class EnumerateService : ServiceBase {public static EnumerateService () {this.ServiceName = "Enumerate Service";this.CanStop = true;}

A.重载OnBoot方法

B.使用下面的代码替换主要代码：EnumerateServiceservice=newEnumerateService（）；service.Run（）；

C.重载OnLoad方法

D.使用下面的代码替换主要的代码：EnumerateServiceservice=newEnumerateService（）；