电池电解液一般为().
A.酸的溶液
B.碱或盐的溶液
C.酸或盐的溶液
D.酸、碱或盐的溶液
参考答案:D
在窗体上画一个名称为Command1的命令按钮,然后编写如下事件过程: Private Sub Command1_Click( ) Dim a(4)As Integer, x As Integer, sum As Integer n = 4: sum = 0 a(1)= 1 For k = 0 To n - 1 For i = 1 To k + 1 x = k + 2 - i a(x)= a(x)+ a(x - 1) If x < n - k Then Exit For sum = sum + a(x) Next i Next k Print sum End Sub 程序运行后,单击命令按钮,则窗体上显示的内容是________。
A.5
B.6
C.8
D.11
变压器油中溶解气体在线监测装置取样管路的材质要求()。
A.不锈钢
B.紫铜
C.黄铜
D.朔料