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单项选择题A patient has a prolonged APTT and a normal PT. The APTT is not corrected by factor Ⅷ-deficient plasma but is corrected by factor Ⅸ-deficient plasma.Which factor does the patient appear to be deficient in(所属章节：第七章 ，难度：5)

A、F X

B、F Ⅸ

C、F Ⅷ

D、F Ⅴ

E、FⅡ

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