某村100户农民家庭人均月收入最高为430元,最低为270元,据此分为4个组,形成闭口式等距数列,则组距应为()
A、30
B、40
C、50
D、70
参考答案:B
There are cars here. We like them . [ ]
A. a lot; a lot
B. a lot; a lot of
C. lots of; a lot of
D. lots of; a lot
执行下面的程序,消息框里显示的结果是______。 Private Sub Form_Click() Dim Str As String,S As String,k As Integer Str="abc" S=Str For k=Len(Str) To 1 Step -1 S=S & (Mid(Str,k,1) Next k MsgBox S End Sub