根管机械预备的注意事项之一是

A．根管机械预备不一定要有支点

B．根管锉可超出根尖孔

C．根管预备器械不必要检查

D．器械在管内旋转角度大于180°

E．器械要按号顺序使用，不能跳号

单击一次命令按钮之后，下更程序代码的执行结果为______ 。 Public Sub Proc(a() As Integer) Static i As Integer Doa(i) = a(i) + a(i + 1)i=i+1 Loop While i ＜ 2End Sub Private Sub Command1_Cliek() Dim m As Integer Dim i As Integer Dim x(10) As Integer For i = 0 To 4 x(i) = i + 1 Next i For i = 1 To 2 Call Proc (x) Next i For i = 0 To 4 Print x(i); Next i End Sub

A．3 4 7 5 6

B．3 5 7 4 5

C．1 2 3 4 5

D．1 2 3 5 7