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【单选题】
在窗体上画一个名称为Timer1的计时器控件，要求每隔0.5秒发生一次计时器事件，则以下正确的属性设置语句是A.
Timer1．Interval=0.5
B.
Timer1．Interval=5
C.
Timer1．Interval=50
D.
Timer1．Interval=500
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