nios噪声系统NIabbr.国民保险制度(=National Insurance)nifurpirinol硝呋吡醇Nikkarikoski尼卡里科斯基nidus vespae[医] 蜂房Ni -resist耐蚀高镍铸铁nival surface雪面niflumic acid尼氟灭酸Nikolaishvili尼古拉什维利niobophyllite铌叶石niobium oxide氧化铌niobium alloy铌合金