Dim cnn As New ADODB.Connection
Dim cmd As New ADODB.Command Dim cmd As N
Dim cmd As New ADODB.Command Dim cmd As N
阅读背景：
Dim cnn As New ADODB.Connection -----Dim cnn As ADODB.Connection解释一下 有new和没有new在使用有何不同？分别用在何处？
来源：互联网
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