NNA=National Newspaper Association 全国报业协会[美]nn.字母nN. D. Arutiunova阿鲁久诺娃N--applying rate氮水平n-conductor cord n芯塞绳N-utilization rate氮肥利用率N.A.A.C.P.abbr.=National Association for the Advancement of Colored People 全国有色人种促进会N-foymylsarcolysin甲酰溶肉瘤素, 氮甲n.e.p.a.l.尼......Nnetwork environment网络环境nnoxiousness process无害化处理N-allylnormorphine烯丙吗啡