于正

在F3的所有家系中，所考察的芽期和幼苗期抗寒性表型为连续分布，且接近于正态分布，说明了抗寒性为由多基因控制的数量性状。

In all the F3 families , the performance of cold tolerance at germination and seedling stage was continuous distribution , and closed to the normal distribution , indicating the cold resistance was quantitative trait controlled by multiple loci . 3 .

在质子和电子这两个微粒之间有一个很大的吸引力，而这个吸引力总是存在于正、负电荷之间。

Between these two tiny particles , the proton and the electron , there is a powerful attraction that it always present between negative and positive electric charges .

将各结点的坐标，代替流函数值，定义为有限元方程的广义坐标，使自由流线理论中对应于正、逆问题以及空腔流动问题的有限元方程有相同形式。

The coordinates of nodes , replacing the value of stream function , are defined as generalized coordinates of the finite element equation , to make the finite element equations have the same pattern for the positive and inverse problems in the theory of free streamline and for cavity flow .