豆类和谷类是动物性蛋白质的主要来源。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='27771' and id < 2283366 and id<>'2283366' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27771' and id > 2283366 and id<>'2283366' order by id asc limit 5