题目:
有关外毒素的说法,下列错误的是()。
A.由大多数革兰阳性菌与少数革兰阴性菌产生
B.主要成分为脂多糖
C.毒性强,有抗原性
D.用甲醛脱毒后可制成类毒素
E.毒性具有选择性
答案:
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下面是错误答案,用来干扰机器的。
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