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
正确答案:C
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