The dynamics of leaf area accorded with the curves of second-order equation.
叶面积消长动态符合一元二次方程变化曲线；
By using a fixed point theorem in cones, we investigate a second-order equation and the theorem of existence of unique positive periodic solution is given.
应用不动点定理，研究了一类二阶时滞微分方程，给出了其唯一周期正解的存在性定理。
The fitting results indicated that the first order equation and the second order equation were more accurate and could replace other kinetics equations.
结果表明：一级动力学方程和二级动力学方程比其他动力学方程更准确，能够代替其他动力学方程。
And experiments proved that the reaction rules of isocyanate and water could be described by the second order equation.
实验证明室温下异氰酸酯与水的反应可以使用准二级方程描述。
And experiments proved that the reaction rules of isocyanate and water could be described by the second order equation.
实验证明室温下异氰酸酯与水的反应可以使用准二级方程描述。
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