题目：
含有丝氨酸活性中心的是（）
A.Ⅻ
B.Ⅺ
C.凝血酶
D.Ⅸ
E.Ⅹ
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
含有丝氨酸活性中心的是（） A.Ⅻ B.Ⅺ C.凝血酶 D.Ⅸ E.Ⅹ
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