"m" gnus-summary-repair-multipart
"v" gnus-article-view-part
"o" gnus-article-save-part
+ "O" gnus-article-save-part-and-strip
+ "d" gnus-article-delete-part
+ "j" gnus-article-jump-to-part
"c" gnus-article-copy-part
"C" gnus-article-view-part-as-charset
"e" gnus-article-view-part-externally