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补体系统的激活三条途径：  A. 经典途径 B. 膜攻击途径 C.  MBL途径 D. 旁路途径

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在正弦信号作用下，输出的稳态分量与输入的参数比称为频率特性 正确 错误
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Why is Rose arranged to marry Cal? A、Because her family has got bankrupted. B、Because her mother wants her to marry Cal to stay in the upper class. C、Because Rose is spoilt and cannot live without the help of Cal. D、Because Rose’s father has arranged the marriage beforehand.
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