初产妇Rh（一），胎儿Rh（+），分娩时多数是处于（）
A.原发免疫反应期
B.原发免疫反应的潜伏阶段
C.继发免疫反应期
D.非特异性免疫期
E.非特异性免疫潜伏期
参考答案：B
解析：Rh血型不合时，胎儿红细胞经胎盘进入母体循环中，被母体脾脏的巨噬细胞所吞噬，需要经过相当长一段时间才能释放出足够量的Rh抗原，该抗原抵达脾脏淋巴细胞的相应抗原受体而产生Rh抗体，这种初发免疫反应发展缓慢，常历时2个月以上甚至长达6个月，故第1胎胎儿分娩时仅处于原发免疫反应的潜伏阶段。
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