交流电动机的定子组成主要有（） 铁心。 换向器。 换向极。 机座。 绕组。
You are creating a Windows Forms application by using the .NET Framework 3.5.You write the following code segment to bind a list of categories to a dropdown list.（Line numbers are included for reference only.） You need to ensure that the dropdown list meets the following requirements： （1）Displays all category names （2）Uses the category ID as the selected item value Which code segment should you add at line 06？（） A。 B。 C。 D。
什么是孔隙度？岩石的孔隙度有几种？
配气相位
What is the new Oracle Shared Server?（） An improved version of multithreaded server configuration. 。 A connection pooling configuration where several clients are connected to the same server process. 。 Two more database servers, which share data by means of database links; the client software is unaware to which server it is connected. 。 A configuration of Real Application Cluster where the client connection is routed to the least busy instance.&e。
职工应当参加工伤保险、生育保险，由用人单位缴纳和职工共同缴纳保险费（）。
