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12-3-1-纵波在一小段媒质中的传播-尤景汉
Author:
王翚
GeoGebra
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近似值：有效數字
Earth with coastline
三半圓間的相切圓(Codex╱2026.10.07)
湖南省张毅郴数字教研工作室 logo
算柱 (兩位數)
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排列
曲柄搖桿接雙搖桿
不規則圖形的周界(T)
Angle at Centre and Angle at circumference
高长乐
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Quadratic Equations
Equilateral Triangles
Parallelogram
Square
Fractions