某样品溶液不加镁粉而仅加盐酸显红色，该样品中可能含有的化学成分是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30715' and id < 2474707 and id<>'2474707' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30715' and id > 2474707 and id<>'2474707' order by id asc limit 5