A:Because we have not got enough preparatio
B:Good idea
C:It is all because of the terrible weather
D:Not all would like to attend it
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莲叶( )
一个圆柱的轴截面平行于投影面,圆柱的正投影是邻边长分别为4cm,3cm的矩形,求圆柱的表面积和体积.