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单项选择题A patient has a prolonged APTT and anormal 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

A、Factor Ⅹ

B、FactorⅨ

C、FactorⅧ

D、Factor Ⅴ

E、Factor Ⅱ

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