45.B型血友病是缺乏第幾凝血因子?
(A)Ⅱ
(B)Ⅴ
(C)Ⅸ
(D)Ⅹ
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統計: A(98), B(224), C(2611), D(191), E(0) #1944075
統計: A(98), B(224), C(2611), D(191), E(0) #1944075