短語詞組短語family y of curves 曲線族family of stationary curves [數(shù)]平穩(wěn)曲線族family of cost curves 成本曲線家族family of performance curves 靜特性線族family of characteristic curves 特性曲線族family of quadric curves 二次曲線族family of discrete curves 離散曲線族a family of curves 曲線族 返回 family of curves