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鐘面的時間（時和分）
Author:
marcolee201314
GeoGebra
New Resources
中华人民共和国国旗
活动三：应用性质
科赫雪花
三角函数 的副本
盈利與虧蝕
Discover Resources
大邊對大角
圓面積的展開
Rotation in the Coordinate Plane
線性規劃
數織Nonogram
Discover Topics
Power Functions
Special Points
Trapezoid
Definite Integral
Upper and Lower Sum or Riemann Sum