[填空题] IPSec的运行模式可分为（）和（）两种。

软件缺陷是指软件未达到软件产品需求说明书中指明的要求。 以下不属于纵向思维的特点的是？（） ["单维性","动态性","平面性","历时性"] You are creating a Web Form. You write the following code segment to create a SqlCommand object. SqlConnection conn = new.SqlConnection(connString); conn.Open(); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = “select cont(*) from Customers”; You need to display the number of customers in the Customers table. Which two code segments can you use to achieve this goal? （） [" object customerCount = cmd.ExecuteScalar();lblCompanyName.Text = customerCount.ToString();"," int customerCount = cmd.ExecuteNonQuery();lblCompanyName.Text = customerCount.ToString();"," SqlDataReader dr = cmd.ExecuteReader();dr.Read();lblCompanyName.Text = dr[0].ToString();"," SqlDataReader dr = cmd.ExecuteReader();dr.Read();lblCompanyName.Text = dr.ToString()"] （）的一般意义是指文件地址之间建立直通的连接关系，设置超级链接可以采用两种途径：（）和（）。 矿床在地表风化？研究这些变化有何意义？ IPSec的运行模式可分为（）和（）两种。