Results There were no obvious difference in opacity of cortical and nuclear in the 2 groups; There were obvious difference in posterior capsular opacity in the 2 groups.
目的 探讨长期小剂量电离辐射对晶状体损伤的远后效应。
This paper mainly discusses direct current system and the transformer remote backup protection problem, especially the problem when a fault occurs at the angle-connection side (non-battery side) of transformer, and furthermore the transformer s protection loses its DC battery.
在电网规划、设计以及运行管理中,变电站直流系统和变压器远后备保护,对于从技术上保证电力变压器安全可靠运行是至关重要的。