原生质中最丰富的物质是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29808' and id < 2420691 and id<>'2420691' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29808' and id > 2420691 and id<>'2420691' order by id asc limit 5