[2014·宁化模拟]若向量a＝(2x,1,3)，b＝(1，－2y,9)，且a∥b，则(  )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19590' and id < 1708960 and id<>'1708960' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19590' and id > 1708960 and id<>'1708960' order by id asc limit 5