nmhnautical miles per hour 海里/小时NMHA[医][=National Mental Health Association]全国心理卫生协会，全国精神保健协会NMHBNational Materials Handling Bureau 全国原料处理局NMHCNational Materials Handling Center <英>全国物料搬运中心NMHSNational Maritime Historical Society 国家海运历史协会NMHSANational Mine Health and Safety Academy 全国煤矿卫生和安全学会NMHnauticalmilesperhour..