西北电网与华中电网实现联网是通过()工程。
A.德宝直流
B.灵宝背靠背
C.高岭背靠背
D.银东直流
参考答案:A
开采保护层时,要同时抽放被保护层的瓦斯。
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