[单选]

You are developing a Windows Communication Foundation (WCF) service that does not operate on a duplex channel.You find that operations do not start until all previous operations have finished. The service hosting code contains the following lines.var service = new WarehouseService(); var host = new ServiceHost(service);You need to ensure that new operations do not wait for previous operations to finish.
Which attribute should you use to decorate the service?（）

固定资金的特点是（）。 价值转移和补偿是一次完成的。 价值一次投资分次收回。 价值补偿与实物更新分离。 存在于多个生产过程。 通过“放生”和“熊猫”谈谈如何保护动物？ You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. The instance contains a database named DB1. An application which is continuously connected uses DB1. The application extensively uses the INSERT command and triggers the population of multiple tables. Now you notice that the application has a poor performance. You doubt that this problem has something to do with blocking. You have to monitor the state of the instance at regular intervals while not affecting the application performance further.  Which tool should you use? （）  You should use Dynamic Management Views 。 You should use SQL Server Resource Governor 。 You should use SQL Server Profiler 。 You should use Windows System Monitor。 在组织形象识别系统中，被简称为MI的是（） 理念识别系统。 行为识别系统。 视觉识别系统。 效能识别系统。 Your company has a single active directory domain. The company has a main office and three branch offices. The domain controller in the main office runs windows 2008 server and provides DNS for the main office and all of the branch offices.Each branch office runs windows server 2008. Users in the branch offices report that it takes a long time to access network resources. You confirm that there are no problems with WAN connectivity or bandwidth. You need to ensure that users in the branch offices are able to access network resources as quickly as possible. Which two actions should you perform? （） Configure a standard primary zone in each of the branch offices.。 Configure a forwarders that point to the DNS server in the main office.。 Configure a secondary zone in each of the branch offices that users the main office DNS server as a master.。 Install DNS servers in each of the branch offices.。

You are developing a Windows Communication Foundation (WCF) service that does not operate on a duplex channel.You find that operations do not start until all previous operations have finished. The service hosting code contains the following lines.var service = new WarehouseService(); var host = new ServiceHost(service);You need to ensure that new operations do not wait for previous operations to finish.
Which attribute should you use to decorate the service?（）