皮皮学，免费搜题
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搜题
【单选题】
人工被动免疫的特点是A.
接种后立即发挥作用
B.
免疫力可维持数年
C.
主要用于传染病的预防
D.
注入机体的是抗原
E.
免疫力出现慢
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【单选题】Criticism and self-criticism are necessary ______ they help us to find and correct our mistakes.
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