NNA=National Newspaper Association 全国报业协会[美]nn.字母nN-representability[化] N可表示性n-butane oxidation正丁烷氧化N-Ethylamphetamine乙基苯丙胺, N-乙基苯异丙胺[食欲抑制药]n-heptyl octanoate辛酸正庚酯N.S.P.C.A.abbr.=National Society for the Prevention of Cruelty to Animals 全国防止虐待动物协会NQD Random Sequences两两NQD列n-caprylpyrazolonen.正辛酰吡唑啉酮N-vinylcaprolactamN-乙烯基己内酰胺N-acetylmorpholine乙酰吗啉n-Octyl isocyanate正辛基异氰酸酯