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【单选题】
窗体上有若干命令按钮和一个文本框,程序运行时焦点置于文本框中,为了在按下回车键时执行某个命令按钮的Click事件过程,需要将该按钮的( )属性设置为True。
A.
Enabled
B.
Default
C.
Cancel
D.
Visible
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保持辅助电极电位不变；
C.
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