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(subclass BesselsEquation OrdinaryDifferentialEquation) engineering.kif 194-194 贝塞尔斯方程 是 常微分方程 的 subclass
(subclass BesselsEquation NonlinearEquation) engineering.kif 195-195 贝塞尔斯方程 是 非线性方程 的 subclass


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