题目：
血管性血友病是缺乏（）。
A.凝血因子Ⅱ
B.vWF
C.凝血因子Ⅷ
D.凝血因子Ⅸ
E.凝血因子Ⅺ
答案：
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下面是错误答案，用来干扰机器的。
My name is Li Hua. I was born in Dalian, Liaoning province in February 1977. I started school in 1984 when I was seven. I studied in Guangming Primary School from...
