选择性IgA缺陷症是属于()。
A.B细胞缺陷病
B.T细胞缺陷病
C.T、B细胞联合免疫缺陷病
D.吞噬细胞缺陷
E.补体系统缺陷
参考答案:A
. In that country, the rich ______ richer, the poor, poorer.
A.become
B. has become
C.becomes
D.is becoming
汉德森-海森巴赫(Henderson-Hasselbalch)方程(HH方程)对弱有机酸药物的方程式是
A.pH-pKa=logfu/fi
B.pKa-pH=logfu/fi
C.pH-pKa=fu/fi
D.pH-pKa=fi/fu
E.pKa-pH=log(l-fu/f