硝化作用是指硝酸盐经硝化细菌还原氨和氮的作用
参考答案：错
My home is near the hospital. It's not .[ ]
A. near
B. big
C. far
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 Str"" S＝"Access" For i＝Len(S)To 1 Step-1 Str＝Str & Mid(S,i,1) Next i MsgBox Str End Sub
