二阶: second order二阶方程: second order equation; second-order equation重力异常阶方差: degree variance of gravity anomaly二阶: [数学] second order方差: dispersion; mean square deviation; variance高阶方程: equation of higher order高阶方程式: equation of higher order四阶方程: fourth-order equation一阶方程: first order equation二阶的: divalent二阶段: two-stage二阶法: second-order method二阶基: divalent radical二阶矩: second moment; secondary moment; secondarymoment二阶铃: second order fluid二阶酸: diatomic acid; dihydric acid二阶堂: nikaido一阶方程, 一次方程: first-order equation半方差: semivariance差异，方差: variance方差,均方: variance方差比: f ratio; variance ration; varianceratio方差法: variance method方差律: variance law方差洛: fuangchaloei
