下列语句中，是命题的个数是（  ） ①|x+2| ②－5∈Z③π R ④{0}∈N

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19874' and id < 1725401 and id<>'1725401' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19874' and id > 1725401 and id<>'1725401' order by id asc limit 5