将一个PowerPoint演示文稿保存为放映文件，最优的操作方法是 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29841' and id < 2421893 and id<>'2421893' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29841' and id > 2421893 and id<>'2421893' order by id asc limit 5