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 <description><![CDATA[PLC梯形图和电气梯形图差不多的。就是中间继电器之间的逻辑关系那个。呵呵我也不是高手哦。]]></description>
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 <author><![CDATA[我爱问问]]></author>
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 <pubdate><![CDATA[Fri, 30 Jul 2010 09:51:17 +0000]]></pubdate>
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