在此基础上，提出了简便、实用的圆锥曲线公切圆作图法。
On this basis, a practical simple way to construct by the conical curves the common tangent circle is presented.
通过测试电烤箱的阶跃响应，用作图法得到电烤箱的模型。
From the step response of the electric oven, the model of the oven is obtained.
该方法不仅具有作图法的度和实验意义，而且还有线性回归法的数学意义。
This method has not only the precision of the charting method and the experimental meaning, but also the mathematical meaning of the linear regression method.
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