下图为非洲东部地区图，图中的符号代表何种地貌（    ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19488' and id < 1688492 and id<>'1688492' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19488' and id > 1688492 and id<>'1688492' order by id asc limit 5