如图，用一平面竖直地去截放在桌面上的圆柱，下列结论正确的有：①截面呈正方形；②AD∥BC，AB∥CD；③AB⊥BC，AD⊥AB；④AD=BC，AB=CD[]A.一个B.二个C.三个D.四个-七年级数学

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