风室体通过吸丝带的网孔向竖直吸丝道提供足够负压,使抛入吸丝道内的烟丝获得足够()随气流上升,吸附于网孔吸丝带上形成烟丝束。
A.摩擦力
B.负压
C.速度
D.真空度
参考答案:C
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 Single) 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 Single) PopupMenu Bs End Sub
C.Private Sub FOrm_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Single) PopupMenu Bs,0 End Sub
D.Private Sub Form_MouseDown(Button As Integer,Shin As Integer,- X As Single,Y As Single) If(Button=vbLeftButton)Or(Button=vbRightButton)Then PopupMenu Bs End Sub
胸痹阴寒凝滞证,其临床特点是()。
A.胸部刺痛,入夜尤甚
B.胸闷隐痛,时作时止
C.胸闷如窒,气短喘促
D.胸闷气短,畏寒肢冷
E.胸痛彻背,感寒痛甚