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问题 单项选择题 A1/A2型题

产妇初乳中含量丰富的免疫球蛋白是（）

A.IgG

B.IgM

C.sIgA

D.IgE

E.IgD

答案

参考答案：C

解析：sIgA主要存在于胃肠道、支气管分泌液、初乳、唾液、泪液中，是参与黏膜局部免疫的主要抗体。

填空题

执行下面程序,单击命令按钮cmd1后,窗体上显示的第一行内容是___(13)___,第二行内容是___(14)___ ;最后一行内容是___(15)___ Option Explicit Private Sub Cmdl_Click()Dim i As Integer,c As Integer,s As String,t As String*1Dim a() As String,s1 As String,jg As Integers="43X17Z23Y"’For i=1 To Len(s) t=Mid(s,i,1) s1=s1 & t If t>="X" And t<="Z" Then c=c+1 ReDim Preserve a(c) a(c)=s1 s1="" End IfNext iCall sub1(a,jg)Print jg EndSub Private Sub sub1(a() As String,gj As Integer)Dim i As IntegerFor i=1 To UBound(a) gj=gj+tran(a(i))Next igj=gj/UBound(a) End Sub Private Function tran(ss As String)As IntegerDim i As Integer,t As Integer,st As String*1Dim P As IntegerP=Len(ss)-1st=Right(ss,1)If st="X" Then t=8ElseIf st="Y" Then t=10Else t=16End IfFor i=1 To P tran=tran+Val(Mid(ss,i,1))*t^(P-i)Next iPrint tran End Function
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单项选择题

CO2气体保护焊的特点包括（）。

A.焊接成本高

B.生产效率高

C.焊接变形大

D.只适合焊接厚板
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