在直角坐标系中横纵坐标均为整数的点称为“格点”,如果函数 的图像恰好通过 个格点,则称函数 为 阶格点函数,下列函数中“一阶格点”函数有( ) ① ② ③ ④
A.
①③
B.
②③
C.
①④
D.
②④
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