在华为交换机上,一个VLAN不能同时作为()和()。
参考答案:Super VLAN;isolate-user-vlan
某地区有一座工厂,烟囱常年向周围排放废气。经初步测定,废气的主要成分有烟尘、二氧化硫、苯并(a)芘(BaP)和一氧化碳等。若要对该污染源进行调查评价,最合适的指标为()
A.排放浓度
B.超标率
C.等标污染负荷
D.超标倍数
E.排放体积
下面的程序是由鼠标事件在窗体上画图,如果按下鼠标将可以画图,双击窗体可以清除所画图形。补充完整下面的程序。首先在窗体层定义如下变量: Dim PaIntStart As Boolean 编写如下事件过程: Private Sub Form_Load()DrawWidth=2ForeColor=vbGreen End Sub Private Sub Form_MouscDown(Button As Integer,Shift As Integer,_X As Single,Y As Single) [13] End Sub Private Sub Form_MouseMove(Button As Integer,Shift As Integer,_X As Single,Y As Single)If PaintStart Then PSet(X,Y)End If End Sub Private Sub Form_MouseUp(Button As Integer,Shift As Integer,_ X As Single,Y As Single) [14] End Sub Private Sub Form_DblClick() [15] End Sub