血友病患者多缺乏下列哪种凝血因子()
A.凝血活酶(因子Ⅲ)
B.Ca2+(因子Ⅳ)
C.SPCA(因子Ⅶ)
D.AHF(因子Ⅷ)
E.PTC(因子Ⅸ)
参考答案:D
33.A cool rain was falling_________with snow causing heavy traffic.
A.mixed B mixing C.to mix D.having mixed
两数相乘,交换因数的位置,积不变。[ ]