如果存在如下过程：
Private Function Fun( a( ) As Integer)
Dim First As Integer, Last As Integer, i As Integer
First = LBound(a)
Last=UBound (a)
Max = a(First)
For i=First To Last
If a(i)＞Max Then Max =a(i)
Next
Fun=Max
End Function
在窗体上添加一个命令按钮，然后编写如下事件过程：
Private Sub Command1_Click()
ReDim m(1 To 4) As Integer
m(1) =20: m(2) =30: m(3) =50: m(4) =100
c =Fun(m)
Print c
End Sub
单击命令按钮，其输出结果为 【10】 。

风力发电机组的电压偏差适应能力测试时电网电压在0.9p.u.～1.1p.u.范围内调节，电压调整的步长为额定电压的（）%。

A.1

B.2

C.3

D.4