短語(yǔ)詞組短語(yǔ)approximate partial derivative 近似偏導(dǎo)函數(shù)approximate derivative calculation 近似導(dǎo)數(shù)計(jì)算standard approximate derivative 標(biāo)準(zhǔn)近似導(dǎo)數(shù) 返回 approximate derivative