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http://www.edacn.net/cgi-bin/forums.cgi?forum=7&topic=9127下,则R3～R0的输出信号中会有一个为1,但我们还是是无法确定哪一个键被按下,必須要

		
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<TD><FONT color=#3c72c4>&nbsp;&nbsp;</FONT><A href="http://www.mcuw.com/"><FONT color=#3c72c4>中国单片机世界</FONT></A>&nbsp;&nbsp;&nbsp;&nbsp; <A href="http://www.ic666.com/"><FONT color=#5e87a2>全球电子元器件工厂采购网</FONT></A>&nbsp; <A href="http://www.c51.cn"><FONT color=#5e79a2>单片机自学网</FONT></A>&nbsp;&nbsp; <A href="http://www.mcuyjf.com.cn/"><FONT color=#668599>单片机电子研发室</FONT></A>&nbsp; <A href="http://www.zwmcu.com/"><FONT color=#4d9eb3>紫微单片机</FONT></A></TD>
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<TD width=370 height=27>&nbsp;&nbsp; 单片机坐标 www.mcuzb.com 版权所有<FONT face="Times New Roman"><BR>Copyright &copy; 2003 - 2004 mcuzb.com, All Rights Reserved</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </TD>
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<TD vAlign=top width=82 height=27><B><FONT color=#ff0000>技术支持:</FONT></B></TD>
<TD vAlign=top width=302 height=27><B><FONT color=#ff0000><A href="http://www.hitzbl.com"><FONT color=#ff0000>哈尔滨众邦龙科技开发有限公司</FONT></A><BR>哈尔滨工业大学硬件实验中心</FONT></B></TD></TR>
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<TD width=370 height=15><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT><STRONG><FONT color=#dd22dd>Email:[e-mail]</FONT></STRONG></TD>
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<TD width=400 colSpan=2 height=15><B><FONT color=#ff00ff>站长：张云奎</FONT></B></TD></TR>
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<TD width=370 height=16>&nbsp;&nbsp; <STRONG><FONT color=#ff0033>联系QQ:383547</FONT></STRONG></TD>
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<TD width=400 colSpan=2 height=16><B><FONT color=#008080>网站维护：鞠春阳</FONT></B></TD></TR>
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<TD width=370 height=12>&nbsp;&nbsp; 联系人：鞠春阳</TD>
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<TD width=400 colSpan=2 height=12>周边技术人员：董石权、梁衍龙、刘万峰、高纪</TD></TR>
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<TD width=370 height=12>&nbsp;&nbsp; 地址:黑龙江省哈尔滨市南岗区邮政街434号810室</TD>
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