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在矩形ABCD中,AB=5cm,AD=2cm,以AB为轴旋转一周,所得圆柱的侧面...
在矩形ABCD中,AB=5cm,AD=2cm,以AB为轴旋转一周,所得圆柱的侧面积为( )
A.70πcm2
B.10πcm2
C.28πcm2
D.20πcm2
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