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【多选题】
以下是蛋白质消化过程的有A.
在胃中，胃酸pH=1-2,使蛋白质变性，结构打开
B.
胃蛋白酶原在胃酸作用下激活，分解蛋白质
C.
胰腺分泌胰蛋白酶和蛋白酶继续分解蛋白质
D.
蛋白质通过消化，变性
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