A. pre-reading activities
B. while-reading activities
C. before-class preparation
D. post-reading activities
第1题:
A. is
B. does
C. Do
第2题:
X线平均波长(λmean)与最短波长(λmin)的关系,正确的是
A、λmean=3.5λmin
B、λmean=3.2λmin
C、λmean=2.8λmin
D、λmean=2.5λmin
E、λmean=2.2λmin
第3题:
第4题:
You are creating a Web Form. You write the following code segment to create a SqlCommand object.Dim conn As SqlConnection = New SqlConnection(connString)conn.Open()Dim cmd As SqlCommand = conn.CreateCommand()cmd.CommandText = "select count(*) 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?()
A. Dim customerCount As Object = cmd.ExecuteScalar()lblCompanyName.Text = customerCount.ToString()
B. Dim customerCount As Integer = cmd.ExecuteNonQuery()lblCompanyName.Text = customerCount.ToString()
C. Dim dr As SqlDataReader = cmd.ExecuteReader()dr.Read()lblCompanyName.Text = dr(0).ToString()
D. Dim dr As SqlDataReader = cmd.ExecuteReader()dr.Read()lblCompanyName.Text = dr.ToString()
第5题:
X线平均波长(λmean)与最短波长(λmin)的关系是
A.λmean=3λmin
B.λmean=2.5λmin
C.λmean=2λmin
D.λmean=1.5λmin
E.λmean=λmin
第6题:
以下代码片段执行后,text的值为:() var i=1, text=''; do { text += i; i++; } while (i < 5);
A.15
B.10
C.6
D.1234