Read Edit View history 定性理论 dìngxìnglǐlùn qualitative theory Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 定性理论/定性理論 · dìngxìnglǐlùn · qualitative theory 2026/03/04 定性理论 / 定性理論 dìngxìnglǐlùn qualitative theory qualitative theory 常微分方程的定性理论主要研究解的几何性质。 created sense Mar 4, 2026, 02:25 AM