对窗体编写如下事件过程： Private Sub Form_MouseDown(Button As Integer，Shift As Integer,X As Single，Y As Single) If Button = 2 Then Print"AAAAA" End If End Sub Private Sub Form_MouseUp(Button As Integer，Shift As Integer，X As Single，Y As Single) Print "BBBBB" End Sub 程序运行后，如果单击鼠标右键，则输出结果为 ______。

A．AAAAA BBBBB

B．BBBBB

C．AAAAA

D．BBBBB AAAAA

电极下放时的高度，要使电极处于上限时，电极下端的高度应（）钢包200mm以上。

A.高于

B.低于

C.等于