短語詞組短語stretching quadric 拉伸二次曲面nonsingular quadric [數(shù)]非奇異二次曲面;滿秩二次曲面;非奇二次曲面quadric coordinates 二次曲面坐標ruled quadric [數(shù)]直紋二次曲面reciprocal quadric [數(shù)]反二次型quadric expression [數(shù)]二次式concentric quadric 同心二次曲面quadric regression 二次回歸regular quadric 規(guī)則二次曲面quadric surface 二次曲面 返回 quadric