请说明管理层次与幅度的含义。
沉管灌注桩在施工过程中，拔管速度过快不会引起哪项问题（） 缩颈。 夹泥。 断桩。 吊脚桩。
关于替换文本的描述正确的是（） 设计鼠标经过图像时，必须设置替换文本。 替换文本的作用是代替对应的图片。 替换文本的作用是当鼠标指向对应的图片时，在鼠标位置旁会弹出一个包含替换文本内容的文本显示区域。 设计导航条时，必须设置替换文本。
You are creating an ASP.NET web application that hosts several Windows Communication Foundation (WCF) services. The services have ASP.NET Compatibility Mode enabled. Users authenticate with the Web application by using a cookie-based ASP.NET Forms Authentication model. You add a service file named Authentication.svc that contains the following code segment: <%@ ServiceHost Service="System.Web.ApplicationServices.AuthenticationService" Factory="System.Web.ApplicationServices.ApplicationServicesHostFactory" %> You need to ensure that users can access the WCF services without having to re-authenticate. Which two configuration settings should you add? (Each is part of a complete solution. Choose two.)（） In the system web. Extensions scripting/webServices/authenticationService element, set the enabled attribute to true.。 In the system web. Extensions scripting/webServices/profileService element, set the enabled attribute to true.。 Add a service endpoint with basicHttpBinding for the contract System.Web.ApplicationServices.AuthenticationService.。 Add a custom service behavior named AuthenticationService Type Behaviors with a service AuthenticationManager element that has service AuthenticationManagerType set to System.Web.Security.SQL Membership Provider。
混流式水轮机座环作用是什么？
Which methods allow COM components to be used in .NET applications？（）
