函数f(x)=1/x乘ln(根号下x方-3x+2+根号下-x方-3x+4)的定义域为( )A.(负无穷大,4 ] U [2,正无穷大] B.(-4,0)U(0,1) C.[-4,0]U(0,1] D.[4,0)U(0,1)

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