窗体的MouseDown事件过程 Form_MouseDown(Button As Integer,Shift As Integer,X As SinSle,Y As Single) 有4个参数,关于这些参数,正确的描述是
A.
通过Button参数判定当前按下的是哪一个鼠标键
B.
Shift参数只能用来确定是否按下Shift键
C.
Shift参数只能用来确定是否按下Alt和Ctrl键
D.
参数x,y用来设置鼠标当前位置的坐标
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