偏微分方程的积分法 modern partial differential equations: 近代偏微分方程; 现代偏微分方程system of partial differential equations: 偏微分方程组theory of partial differential equations: 偏微分方程理论differential equations: 微分方程partial integration: 偏积分, 部分积分下载手机词典可随时随地查词查翻译