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 <description><![CDATA[6ES7214-1BD23-0XB8和214-1AD22-OXBO区别，前者是继电器输出，后者是晶体管输出，版本的话，前者高后者低，产地的话，前者国产，后者德产。 [s:28]&nbsp;&nbsp;[s:28]]]></description>
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 <pubdate><![CDATA[Tue, 26 Nov 2013 04:50:18 +0000]]></pubdate>
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 <description><![CDATA[BD怎么会是DC供电的]]></description>
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