浓 H 2SO 4与下列物质作用时，只体现酸性的是 （   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19788' and id < 1716908 and id<>'1716908' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19788' and id > 1716908 and id<>'1716908' order by id asc limit 5