Speech ______refers to any distinguishable form of speech used by a speaker.
A. [A] change
B. [B] act
C. [C] variety
D. [D] usage
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用于获得字符串S最左边4个字符的函数是
A. Left(S,4)
B. Left(1,4)
C. Leftsv(S)
D. Leftstr(3,4)
In the United Kingdom, is the real source of power.
A. [A] the Privy Council
B. [B] the Monarch
C. [C] the House of Lords
D. [D] the House of Commons
设已经在菜单编辑器中设计了窗体的快捷菜单，某顶级菜单为a1，且取消其“可见”属性。运行时，哪个事件过程可以使快捷菜单的菜单项响应鼠标左键单击和右健单击的事件过程是
A. Private Sub Form_MouseDown(Button As Integer，Shift As Integer,_X As Single，Y As Single)
B. If Button=2 Then PopupMenu al,2
C. End Sub
D. Private Sub Form_MouseDown(Button As Integer，Shift As Integer,_X As Single，Y As Single
E. PopupMenu al,0
F. End Sub
G. Private Sub Form_MouseDown(Button As Integer，Shift As Integer,_X As Single，Y As Single
H. PopupMenu al
I. End Sub
J. Private Sub Form MouseDown(Button As Integer，Shift As Integer,_X As Single，Y As Single
K. If(Button=vbLetfButton)Or(Button=vbRightButton)Then PopupMenu al
L. End Sub
下列税务代理情形中，委托方不能单方终止代理行为的是( )。
A. 税务师事务所为委托方更换注册税务师
B. 税务师事务所解散
C. 税务师事务所因经营不善破产
D. 注册税务师未按代理协议的约定提供服务
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