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 <description><![CDATA[楼主&nbsp;&nbsp; 频率和周期&nbsp;&nbsp;这个不难理解吧 周期=1/频率&nbsp;&nbsp;]]></description>
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 <author><![CDATA[祥林嫂]]></author>
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 <pubdate><![CDATA[Mon, 23 Apr 2012 13:13:10 +0000]]></pubdate>
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 <description><![CDATA[1秒=1000000us啊。。。。懂除法就行。。。。]]></description>
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 <author><![CDATA[kyy80]]></author>
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