要求当鼠标在图片框Pl中移动时，立即在图片框中显示鼠标的位置坐标。下面能正确实现上述功能的事件过程是______。

A) Private Sub Form_MouseMove(Button As Integer,Shift As Integer,X As Single,Y As Single)

P1.Print X,Y
End Sub
B) Private Sub P1_MouseMove(Button As Integer,Sluft As Integer,X As Single,Y As Single)

P1.PrintX,Y
End Sub
C) Private Sub P1_MouseMove(Button As Integer,Shift As Integer,X As Single,Y As Single)

Print X,Y
End Sub
D) Private Sub P1_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single)

Picture，Print X.Y
End Sub

在X线摄影中，光电效应的负面影响是

A．产生射线

B．产生灰雾

C．增加X线对比度

D．使病人接受的照射量多

E．以上四项都是