强酸强碱中毒时，下列最适合做保护剂的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30902' and id < 2486143 and id<>'2486143' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30902' and id > 2486143 and id<>'2486143' order by id asc limit 5