二阶: second order矩: carpenter's square; square r ...二阶矩范数: second moment norm二阶矩量: second moment二阶矩准则: second-moment criterion任意指定位置的中心矩和二阶矩: central and ordinary moments of any order location: x, y二阶: [数学] second orderk阶矩: k th moment阶矩阵: n-matrix零阶矩: zeroth moment三阶矩: third moment一阶矩: first moment附加一阶矩: additional first moment高阶矩量: high-order moment三阶矩量: third moment四阶矩量: fourth moment一阶矩矩阵: first-moment matrix一阶矩量: first moment一阶矩;一级动差: first moment二阶的: divalent二阶段: two-stage二阶法: second-order method二阶基: divalent radical二阶铃: second order fluid二阶酸: diatomic acid; dihydric acid