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如：字符串“100101000100”中最多可将2个“0”翻转为“1”，变为“100101010101”
s = "0" & Text1.Text & "0"
c = 0: i = 2
Do While i < Len(s)
If ① Then
i = i + 2
ElseIf ② Then
i = i + 1
ElseIf ③ Then
i = i + 3
Else
i = i + 2: c = c + 1
End If
Loop
Label1.Caption = "最多可翻转" & Str(c) & "个0"
上述程序中方框处可选语句为：
①Mid(s,i-1,1) = "1"
②Mid(s,i,1) = "1"
③Mid(s,i+1,1) = "1"
则①、②、③处语句依次是（ ）
| A．①②③ | B．③②① | C．②①③ | D．②③① |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
