1. A
2. D
数学题
最简单的方法是在一条体对角线所对应的两个顶点,切下两个底面是等边,顶点是90度的四面体.底面需满足的要求是,它的高是3*R=19.5厘米.
英语选择提加数学题1.jim_his watch in the classroomA.left B.forget C.l
3个回答
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