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问题 单项选择题

氧气是煤尘爆炸的主要因素。空气中氧的含量高时，点燃“煤尘云”的温度可以降低；氧的含量低时，点燃“煤尘云”困难，当氧含量低于（）时，煤尘就不再爆炸。

A.5%

B.12%

C.0.18

D.0.2

答案

参考答案：C

选择题

— Which is more important, English or math?

—I think English is as _______ as math.

A．important

B．more important

C．most important

D．the most important
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填空题

执行下面程序,单击命令按钮CmdRun后,文本框Text1中第一行显示的内容是（） , 第二行显示的内容是（）。第三行显示的内容是（）。

Option Explicit

Private Sub CmdRun_Click()

Dim S As String,Subs As String,P As Integer

S="100101 010110 110101"

Do

P=InStr(S," ")

If P<>0 Then

Subs=Left(S,P-1)

Else

Subs=S

End If

S=Mid(S,P+1)

Text1=Text1 & Complement(Subs) & vbCrLf

Loop Until Len(S)=0 Or P=0

End Sub

Private Function Complement(S As String)As Integer

Dim P As Integer,L As Integer

L=Len(S)

If Left(S,1)=1 Then

Complement=-32

End If

P=1

Do Until P=0

P=InStr(P+1,S,"1")

If P<>0 Then

Complement=Complement+2^(L-P)

End If

Loop

End Function
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