Update: I guess I found the answer to this questions.
Once upon a time search engines did not index dynamic pages at all, while today they do index them but generally slower than they index static pages. So if they index the dynamic pages then a backlinks from such as page is useful too.
I will suggest you not to use any "?" mark in your URL. Google will take lots of time to index this type of URL. Keep your URL proper and clear, it's an old SEO strategy.
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