直角坐標平面上有 A(1 , 4)、B(0 , 0)、C(4 , 0)、D(9 , 4)四點，若 E、F 分別為、的中點，則長為多少？ (A)3 (B)4 (C)6 (D)8

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2. 直角坐標平面上有 A(1 , 4)、B(0 , 0)、C(4 , 0)、D(9 , 4)四點，若 E、F 分別為、的中點，則長為多少？
(A)3
(B)4
(C)6
(D)8

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