在Na2S2O3的溶液中加入(),则产生黄色沉淀和刺激性气体,其离子反应方程式为(),这是鉴定S2O32-的常用方法。
在Na2S2O3的溶液中加入(),则产生黄色沉淀和刺激性气体,其离子反应方程式为(),这是鉴定S2O32-的常用方法。
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在窗体中添加一个名称为Command1的命令按钮,然后编写如下程序: Public x As Integer Private Sub Command1_Click() x=10 Call s1 Call s2 MsgBox x End Sub Private Sub sl() x=x+20 End Sub Private Sub s2() Dim x As Integer x=x+20 End Sub 窗体打开运行后,单击命令按钮,则消息框的输出结果为( )。A.10B.30C.40D.50
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