U={(x,y)|x∈R,y∈R},A={(x,y)|2x-y+a>0},B={(x,y)|x+2y-b≤0},则点P(1,4)∈A∩(CuB)的充要条件是.( )A.a>2,b>9 B.a<2,b>9 C.a>2,b<9 D.a<2,b<9
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