诊断血管性血友病(vWD)特异性最高的试验是()
A.vWF多聚体分析
B.血浆vWF抗原
C.血浆vWF活性
D.血浆FⅧ:C水平
E.vWF的胶原结合能力
参考答案:A
—I never thought Jerry can speak English so fluentlyl.
—Well, actually he_________in the USA for two years.
A.was staying
B.stays
C.stayed
D.has stayed
受精卵中的大量的mRNA是在卵细胞受精之前就已经转录好的,但要在受精后才能发挥作用()