根据焊点及元器件的边缘确定焊点区域及元器件区域，采用面积法二次检测假焊；
Pseudo solder joints were inspected firstly by the center of gravity method after positioning the solder joints and its components.
秩次分析法对作物品种区域试验中产量性能的评价是一种实用、可行的数据处理方法。
This rank analysis method was a practical and forthright data analysis method evaluating crop varieties yield in regional trials.
它是一个显式方法，同欧拉法一样，每积分一步，只需计算一次右函数，但它的稳定区域与欧拉法不同。
It is only needed to calculate the right function once for each integration step. But the stability domain is different from the Euler method.
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