属于遗传性因素的是
A.过度吸烟与饮酒B.残根、残冠和不良修复体C.EB病毒D.多种维生素缺乏E.癌基因被激活或抗癌基因被抑制 关于肿瘤的致病因素
参考答案:E
“徒善不足以为政,徒法不足以自行”体现了( )。
A.法的局限性B.法的阶级性C.法的强制性D.法的规范性
设已经在“菜单编辑器”中设计了窗体的快捷菜单,其顶级菜单为Bs,取消其“可见”属性,运行时,在以下事件过程中,可以使快捷菜单响应鼠标右键菜单的是
A.Private Sub Form_Mouse Down(Button As Integer,Shift As Integer,- X As Single,Y As Singl If Button=2 Then PopupMenu Bs,2 End Sub
B.Private Sub Form_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Singl PopupMenu Bs End Sub
C.Private Sub FOrm_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Singl PopupMenu Bs,0 End Sub
D.Private Sub Form_MouseDown(Button As Integer,Shin As Integer,- X As Single,Y As Singl If(Button=vbLeftButtoOr(Button=vbRightButtoThen PopupMenu Bs End Sub