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(subclass OrdinaryDifferentialEquation DifferentialEquation) engineering.kif 188-188 常微分方程 是 微分方程 的 subclass
(subclass BesselsEquation OrdinaryDifferentialEquation) engineering.kif 194-194 贝塞尔斯方程 是 常微分方程 的 subclass
(subclass VanderpolsEquation OrdinaryDifferentialEquation) engineering.kif 199-199 范德波尔斯方程 是 常微分方程 的 subclass


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