自由截面积
Free cross-sectional area
以上为机器翻译结果，长、整句建议使用 人工翻译 。
本文假设了接近砖烟囱实际截面面积的函数，推出了一个变系数的自由振动微分方程。
In this paper, a cross-section function of brick chimney has been assumed based on traditional hypothesis and a variable coefficient free-vibrating differential equation has been derived.
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