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AchR-Ab的效应机制包括( )
A: 直接封闭--竞争性抑制AchR与Ach的结合
B: 间接封闭--干扰AchR与Ach的特异性结合
C: 免疫调节--加速肌细胞摄粒作用和AchR的降解
D: 补体激活--AchR和突触后膜的溶解破坏
E: 以上都是
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