The mass and trace metal element contents in the plant had to be measured in gradeestimation of farm enviroment.
植株金属元素含量是农田环境质量评价中的必检项目。
2
According to the manufacture demand of DOM, the quality property factors of gradeestimation are deduced in this paper.
对照正射影像地图生产要求，本文给出了对其进行质量评定的质量特性要素。
3
Genetic programming method to find the true formula of gradeestimation scientifically was put forward based on the actual data of grade control points.