对窗体编写如下事件过程： Private Sub Form MouseDown(B
题型：单项选择题
问题：
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 ThenPrint "AAA" End If End Sub Private Sub Form MouseUp (Button As Integer，Shift As Integer，_x As Single，Y As Single)Print "BBB" End Sub 程序运行后，如果单击鼠标右键，则输出结果为 ______。
A．AAA BBB
B．BBB
C．AAA AAA
D．BBB
.一质量为m电量为+q的小滑块（可视为质点）以初动能E0从C点出发，沿直线AB向D运动，滑块第一次经过O点时的动能为n E0（n＞1），到达D点时动能恰好为零，小滑块最终停在O点，求：