试述点火提前角对汽油机燃烧的影响？
鼓形控制器触指磨损到4~5mm厚或触片磨损到（）厚时，均须更换。 ["1~1.5mm","1~1.6mm","1~1.7mm","1~1.8mm"]
什么是黑盒测试？黑盒测试的主要方法有哪些？
债券的基本构成要素有（） ["期限","付息频率","票面利率","面值"]
You create a Web Form. The Web Form allows users to log on to a Web site. You implement the login logic using a Login control named Login1. The membership data for the application is stored in a SQL Express database in the App_Data directory. You need to configure your application so that the membership data is stored in a local Microsoft SQL Server database. You add the following code segment to the Web.config file. Which two additional actions should you perform? （） [" Use Aspnet_regsql.exe to create the Microsoft SQL Server database."," Set Login1's MembershipProvider property to MySqlProviderConnection."," Add the following code segment to the Web.config file. <connectionStrings> <add name="MySqlProviderConnection" connectionString="valid connection string" \/><\/connectionStrings>"," Add the following code segment to the Web.config file. <appSettings><add key="MySqlProviderConnection" value="valid connection string" \/><\/appSettings>"," In the ASP.NET configuration settings within IIS, ensure that Role Management Enabled is selected."," Use the Web Site Administration Tool to select AspNetSqlMembershipProvider as the membership provider for your application."]
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