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自由民局
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Freedmen’s Bureau
自由民局
美国内战即将结束时,联邦政府建立的专门管理黑人(实际也包括白人)事务的机构。全称难民、自由民及弃置土地局,隶属陆军部,局长为O.O.霍华德。
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hydrocyanic acid
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hydrocyclone technology for sewage treatment
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