这里有很多个维基百科的镜像，可以在线浏览，也可以下载成离线版： welcome to kiwix server Wikipedia) 如果用 极坐标 表示，其通用数学表达式为： 其中， a 、 b 为系数， r 螺线上的点到坐标原点的距离， θ 为转角。 这正是一个以自然常数e为底的指数函数。 例.
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