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两平面夹角

Author:刘莹

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找出對稱軸
【案例】2018年全国1卷理科12题
第八周作业
兩位數加法
【案例】2013年安徽高考15题

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三角型
Time
切線段等長
六面體與八面體轉換
正七角錐(旋轉，實體、透視)

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Diagrams
Prism
Geometry
Secant Line or Secant
Surface

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