推导出变换器的稳态特性。
运用拉普拉斯变换推导出其两种求解方法：直接求解法和状态空间法。
Two solving methods are deduced using Laplace transform: the direct solving method and the state-space method.
利用坐标平移、旋转变换，导出旋转曲面面积求法的一般公式。
By making use of transformation of coordinate translation, coordinate rotation, we deduced general formula about area of rotational surface.
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