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It can be interred that prior to 1950, for a historian to choose to specialize in black history
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In the sentence "which it is now doing at the spanking rate of a half a billion tons a second" ( Para. 3), to which of the following does "it" refer
男，35岁，2年来反复乏力、纳差、肝区隐痛，血清转氨酶反复升高，血清球蛋白升高，类风湿因子阳性。查体：可见肝掌及蜘蛛痣，肝右肋下未及，脾肋下1.5cm。化验：肝功能检查 ALT340U/L，T-Bil 71μmol/L，HBV标志物为HBsAg、抗-HBe、抗-HBe阳性。对此病例的诊断应为( )
18岁男孩，近10天来食欲不振、恶心、呕吐，伴乏力、尿黄来医院就诊。病前两周曾注射过丙种球蛋白1支。检查：巩膜黄染，肝肋下 1.0cm，有轻度触痛，脾肋下未触及。化验：肝功能检查ALT770U/L，AST560U/L、T-Bil 89.5μmol/L，抗-HAV-IgM阳性，抗-HAV-IgG阳性，HBsAg阳性，HBeAg阳性，抗-HBc-IgM阳性。应诊断为( )
艾滋病最常用的血清学检查方法是( )
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