磷有效性
p availability
Availability of phosphorus
phosphorus avaliablity
phosphorus availability
phosphorus validity
土壤磷有效性
soil phosphorous availability
有效磷的预测
prediction on available phosphorus
德育教学的有效性探索
Research on the efficacy of moral education
方法技术的有效性
The usefulness of the method
降压的有效性
effective on decreasing hypertension
项目计划的有效性
Effectiveness， in project planning
effectiveness
in project planning
有效性的争论
Putting validity in issue