国产浅冷装置天然气压缩机停机后,应打开(),排净系统中的污油污水。
A.入口放空阀
B.排污阀
C.二段出口阀
D.出口放空阀
参考答案:B
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
我国的库存现金指的是人民币。