皮皮学，免费搜题
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【多选题】
再次免疫应答的特征包括A.
平台期较短
B.
抗体下降缓慢
C.
抗体倍增所需时间短，抗体含量迅速上升
D.
潜伏期明显缩短
拍照语音搜题，微信中搜索"皮皮学"使用
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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.
incredible
B.
amazing
C.
innovative
D.
imagination
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