按涂层厚度分类，钢结构防火涂料的类别可以划分为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24591' and id < 2110434 and id<>'2110434' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24591' and id > 2110434 and id<>'2110434' order by id asc limit 5