It will have effect on the growth and yield of crops when the copper content in soil is over a critical concentration.
当土壤中铜含量超过一定浓度时，将对作物生长发育及产量产生影响。
2
The inner spiral copper tube produced by extrusion-rolling process has a kind of special line defect, which influences the production yield remarkably.
采用挤轧法生产内螺纹铜管时易出现一种特有的线形缺陷，显著影响内螺纹铜管的成材率。
3
By treating this precipitate with nitrous acid followed by a recrystallization process, copper (II) nitrate was recovered in 82.32% yield.