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scratch固定半径范围可变换基础图形和外环数量的螺旋
scratch 固定半径范围可变换基础图形和外环数量的螺旋 知识点：用到画笔工具 知识点：循环画图形的逻辑 难点1移动步长需要用三角函数计算 难点2最大半径作为基准，计算变动的半径数值
scratch少儿编程入门课程 画35图14/39
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