一个人在沼泽地赤脚行走时，容易下陷，下陷时 (  )

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='17783' and id < 1503017 and id<>'1503017' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='17783' and id > 1503017 and id<>'1503017' order by id asc limit 5