Stocks Seen Lower as Oil, Cisco Weigh  NEW YORK (Reuters) - U.S. shares were seen opening weaker  on Wednesday as oil prices held near \$47 a barrel, while a  brokerage downgrade on technology bellwether Cisco Systems Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CSCO.O target=/stocks/quickinfo/fullquote"&gt;CSCO.O&lt;/A&gt; could hurt technology shares.