nnf怎么记

This paper discusses some issues in nested relational databases, which mainly include the e-valuation on two normal forms PNF and NNF, missing information and the conversion form flat rela-tional schema to nested relational schema.

本文讨论了嵌套关系数据库中的一些问题，主要包括对两种范式PNF和NNF的评价、空值和从平面关系到嵌套关系的转换。

Electron microscope scanning surface morphology and XRD analysis showed that inhibitor NNF reduce the increase in the oxygen, sulfur, to form a continuous dense FeS protection film, preventing corrosion.

电镜扫描表面形貌分析和XRD表明，缓蚀剂NNF使氧元素增加、硫元素减少，能形成连续致密的FeS保护膜，阻碍了腐蚀的发生。

For radar using purpose, The data algorithms for NNF and the adaptive a-P filtering and prediction based on "CV" model are studied emphatically.

根据实际雷达跟踪要求，对NNF数据关联算法和基于CV运动模型的自适应滤波与预测算法等作了重点研究。