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时钟（序列文本）
Author:
迟中金
Topic:
Random Variables
GeoGebra
New Resources
【案例】圆柱体内放置一个大球六个小球
【案例】2013年安徽高考15题
畫出對稱圖形
算柱 (兩位數)
兩組對邊相等的四邊形
Discover Resources
交點的極限
選擇合適的「中間人」
Logarithmic spiral
BkD_act15_02c
勒洛四面体（拼接法）
Discover Topics
Cosine
Standard Deviation
Pyramid
Combinatorics
Linear Programming or Linear Optimization