简述酶沉淀分离的主要方法及其原理。
You work as a Web Developer at Certkiller.com. You are in the process of creating a Webapplication using Microsoft ASP.NET 3.5. This application will be part of a solution that contains a Windows Communication Foundation （WCF） service project. The Web application will be used to make calls to a service identified in theWCF service project. Management is planning to host the Web application on a separate serverfrom the WCF service. They want the WCF service to perform remotely. You need to add areference to the WCF service. What should you do？（） You should add an assembly reference to the project.。 You should add a project reference to the project.。 You should add a Web reference to the project.。 You should add a service reference to the project.。
社会主义初级阶段是指：（） 任何国家进入社会主义社会都会经历的起始阶段。 社会主义经济基础尚未奠定的历史时期。 我国在生产力落后，商品经济不发达条件下建设社会主义所必然经历的特定阶段。 从我国社会主义改造基本完成到社会主义现代化基本实现的历史时期。 我国社会主义市场经济体制建立健全的历史时期。
为何具有药理效应的药物在临床上不一定有效？
You install two Exchange Server 2010 Edge Transport servers named Server1 and Server2.You need to ensure that e-mail sent from the Internet is sent to Server2 if Server1 fails.What should you do？（） Create two SRV records.Assign the SRV record for Server1 a priority of 20.Assign the SRV record Server2 a priority of 10.。 Create two SRV records.Assign the SRV record for Server1 a priority of 10.Assign the SRV record for Server2 a priority of 20.。 Create two MX records.Assign the MX record for Server1 a priority of 20.Assign the MX record for Server2 a priority of 10.。 Create two MX records.Assign the MX record for Server1 a priority of 10.Assign the MX record for Server2 a priority of 20.。
根据《UCP600》规定，卖方可以凭以结汇的运输单据有（）。
