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【单选题】
SIgA分子分泌片的作用是：
A.
存在于 IgM 和 SIgA 中
B.
能抵抗外分泌液中蛋白酶对 Ig 的降解
C.
粘膜上皮细胞合成
D.
参与 SIgA 分泌到外分泌液的过程
E.
参与 Ig 分子的变构
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