You create a Web Form that displays a GridView. The GridViews data source is a DataSet named dsOrders. The DataSet contains two DataTables named Orders and OrderDetails. You create a relation between the two DataTables using the following code segment. (Line numbers are included for reference only.)01 dtOrders = dsOrders.Tables[“Orders”]; 02 dtOrderDetails = dsOrders.Tables[“OrderDetail”]; 03 colParent = dtOrders.Columns[“OrderID”]; 04 colChild = dtOrderDetails.Columns[“ParentOrderID”]; 05 dsOrders.Relations.Add(“Rell”, colParent, colChild, false); You need to find the cause of the exception being raised in line 05. What should you do? （） [" Ensure that the child column and the parent column have the same names."," Ensure that the child table and the parent table have the same names."," Ensure that the child column and the parent column have the same data types."," Ensure that each row in the child table has a corresponding row in the parent table."," Ensure that the tables have an explicit relationship defined by a foreign key constraint in the database."]
以下知识种类属于信息类知识的是？（） ["原理知识","技能知识","人际知识","经验知识"]
选定需删除的幻灯片后，按一次Delete键即可删除。
PowerPoint提供在演示文稿中加入伴音和影片功能。
风险损失包括（） ["直接损失","间接损失","重大损失","轻微损失","一般损失"]
同时感染
