学习“圆的直径是它半径的两倍”是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30564' and id < 2466565 and id<>'2466565' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30564' and id > 2466565 and id<>'2466565' order by id asc limit 5