设函数fx=x2-4x+6,x≥0x+6,x<0,则不等式fx>3的解集是( )
In April, 2009, President Hu inspected the warships in Qingdao, ______ the 60th anniversary of the founding of the PLA Navy.
唐太宗说:“中书、门下,机要之司,诏敕有不便者,皆应执论。比来唯睹顺从,不闻违异。若但行文书,则谁不可为?何必择才也!这说明唐太宗设立中书、门下的主要目的是( )