建筑材料中大部分无机非金属材料为脆性材料，下列属于无机非金属材料的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30226' and id < 2444968 and id<>'2444968' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30226' and id > 2444968 and id<>'2444968' order by id asc limit 5