I haved ask before some days google and here is a part of the mail
"To be clear, Google AdSense program policy does not permit Google ads to
be published on the same web page as other contextually-targeted ads. More
broadly, our policy does not permit Google ads to be displayed on the same
website as ads that mimic or attempt to be associated with Google ads.
However, if the ads aren't contextually-targeted, they may be placed
alongside Google ads.
For example, AdBrite ads or Adsor ads may be displayed on the same page as
Google ads on your site as long as they don't mimic Google ads."