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【单选题】
机体免疫防御功能过低时,可引起( )A.
自身免疫性疾病
B.
肿瘤发生
C.
免疫耐受性
D.
反应性疾病
E.
反复发生病原生物感染
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A.
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B.
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C.
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D.
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A.
①②
B.
①③
C.
②③
D.
②④
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