The effects of rare-earth elements lanthanum (La~(3+)) and cerium (Ce~(3+)) at different mass concentrations on the growth of Microcystis and Selenastram bibrainum Reinsch in fresh water were studied by stimulated test in laboratory.
通过模拟培养实验,研究了不同质量浓度的稀土元素La3+和Ce3+对2种产地的微囊藻以及月牙藻增殖的影响。
The traditional design method of the crescent rib on the screw-thre ad steel finished product passes is very overelaborate and the results obtained based on it have some errors.
螺纹钢成品孔月牙肋的传统设计法不仅繁琐,并且据此而得出的结果有误差。